Implement attachements in public chat

Signed-off-by: denis0001-dev <denis0001.dev@ya.ru>

app/shared/src/androidMain/kotlin/ru/fromchat/api/local/cache/AttachmentDiskThumbnail.android.kt

@@ -0,0 +1,21 @@
+package ru.fromchat.api.local.cache
+
+import java.io.FileOutputStream
+
+actual fun generateAttachmentDiskThumbnail(
+    sourceAbsolutePath: String,
+    destAbsolutePath: String,
+    maxEdgePx: Int,
+): Boolean {
+    val bitmap = ru.fromchat.api.local.download.decodeSampledImageFile(
+        sourceAbsolutePath,
+        maxEdgePx,
+        maxEdgePx,
+    ) ?: return false
+    return runCatching {
+        FileOutputStream(destAbsolutePath).use { stream ->
+            bitmap.compress(android.graphics.Bitmap.CompressFormat.JPEG, 85, stream)
+        }
+        true
+    }.getOrDefault(false)
+}

app/shared/src/androidMain/kotlin/ru/fromchat/api/local/download/LocalDecodedImageCache.android.kt

@@ -39,7 +39,11 @@ actual object PlatformDecodedBitmapCache {
 }
 
 actual fun decodeLocalImageFile(absolutePath: String, reqWidthPx: Int, reqHeightPx: Int): ImageBitmap? =
-    decodeSampledFromFile(absolutePath, reqWidthPx, reqHeightPx)?.asImageBitmap()
+    decodeSampledImageFile(absolutePath, reqWidthPx, reqHeightPx)?.asImageBitmap()
+
+/** Sampled decode for disk thumbnail generation and tile loads. */
+internal fun decodeSampledImageFile(path: String, reqWidthPx: Int, reqHeightPx: Int): Bitmap? =
+    decodeSampledFromFile(path, reqWidthPx, reqHeightPx)
 
 actual fun decodeImageBytes(bytes: ByteArray, reqWidthPx: Int, reqHeightPx: Int): ImageBitmap? =
     decodeSampledFromBytes(bytes, reqWidthPx, reqHeightPx)?.asImageBitmap()

app/shared/src/androidMain/kotlin/ru/fromchat/api/local/download/LocalImageFileDimensions.android.kt

@@ -0,0 +1,23 @@
+package ru.fromchat.api.local.download
+
+import android.graphics.BitmapFactory
+import androidx.exifinterface.media.ExifInterface
+
+internal actual fun readLocalImageDimensions(absolutePath: String): Pair<Int, Int>? {
+    val bounds = BitmapFactory.Options().apply { inJustDecodeBounds = true }
+    BitmapFactory.decodeFile(absolutePath, bounds)
+    if (bounds.outWidth <= 0 || bounds.outHeight <= 0) return null
+    val orientation = runCatching {
+        ExifInterface(absolutePath).getAttributeInt(
+            ExifInterface.TAG_ORIENTATION,
+            ExifInterface.ORIENTATION_NORMAL,
+        )
+    }.getOrDefault(ExifInterface.ORIENTATION_NORMAL)
+    return when (orientation) {
+        ExifInterface.ORIENTATION_ROTATE_90,
+        ExifInterface.ORIENTATION_ROTATE_270,
+        ExifInterface.ORIENTATION_TRANSPOSE,
+        ExifInterface.ORIENTATION_TRANSVERSE -> bounds.outHeight to bounds.outWidth
+        else -> bounds.outWidth to bounds.outHeight
+    }
+}

app/shared/src/commonMain/kotlin/ru/fromchat/api/ApiClient.kt

@@ -33,6 +33,8 @@ import io.ktor.client.request.put
 import io.ktor.client.request.setBody
 import io.ktor.client.statement.HttpResponse
 import io.ktor.http.ContentType
+import io.ktor.http.Headers
+import io.ktor.http.HttpHeaders
 import io.ktor.http.contentType
 import io.ktor.serialization.kotlinx.json.json
 import kotlinx.coroutines.MainScope
@@ -81,6 +83,12 @@ import ru.fromchat.api.schema.messages.dm.upload.DmUploadInitResponse
 import ru.fromchat.api.schema.messages.dm.upload.DmUploadStatusResponse
 import ru.fromchat.api.schema.chats.publicchat.PublicChatProfile
 import ru.fromchat.api.schema.messages.publicchat.SendMessageRequest
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadChunkRequest
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadChunkResponse
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadCompleteResponse
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadInitRequest
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadInitResponse
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadStatusResponse
 import ru.fromchat.api.schema.server.RegisteredUserCountResponse
 import ru.fromchat.api.schema.server.ServerInstanceIdResponse
 import ru.fromchat.api.schema.server.TransportKeyResponse
@@ -796,6 +804,54 @@ object ApiClient {
         }
     }
 
+    suspend fun initPublicUpload(
+        filename: String,
+        totalSize: Long,
+        chunkSize: Int? = null,
+    ): PublicUploadInitResponse =
+        http.post("${ServerConfig.apiBaseUrl}/public/upload/init") {
+            contentType(ContentType.Application.Json)
+            setBody(
+                PublicUploadInitRequest(
+                    filename = filename,
+                    totalSize = totalSize,
+                    chunkSize = chunkSize,
+                ),
+            )
+        }.body()
+
+    suspend fun getPublicUploadStatus(uploadId: String): PublicUploadStatusResponse =
+        http.get("${ServerConfig.apiBaseUrl}/public/upload/$uploadId") {
+            contentType(ContentType.Application.Json)
+        }.body()
+
+    suspend fun uploadPublicChunk(
+        uploadId: String,
+        offset: Long,
+        dataB64: String,
+    ): PublicUploadChunkResponse =
+        http.patch("${ServerConfig.apiBaseUrl}/public/upload/$uploadId") {
+            contentType(ContentType.Application.Json)
+            setBody(
+                PublicUploadChunkRequest(
+                    offset = offset,
+                    dataB64 = dataB64,
+                ),
+            )
+        }.body()
+
+    suspend fun completePublicUpload(uploadId: String): PublicUploadCompleteResponse =
+        http.post("${ServerConfig.apiBaseUrl}/public/upload/$uploadId/complete") {
+            contentType(ContentType.Application.Json)
+            setBody(mapOf("upload_id" to uploadId))
+        }.body()
+
+    suspend fun abortPublicUpload(uploadId: String) {
+        http.delete("${ServerConfig.apiBaseUrl}/public/upload/$uploadId") {
+            contentType(ContentType.Application.Json)
+        }
+    }
+
     /**
      * Fetch encrypted file bytes. Path is e.g. "/uploads/files/encrypted/xxx.jpg" or "/api/uploads/files/encrypted/xxx.jpg".
      * Backend may return path with /api prefix; apiBaseUrl already includes /api, so we avoid double /api.
@@ -809,6 +865,9 @@ object ApiClient {
         else -> "${ServerConfig.apiBaseUrl}$path"
     }
 
+    /** Plain public-chat attachment URL (same path resolution as [encryptedFileUrl]). */
+    fun normalFileUrl(path: String): String = encryptedFileUrl(path)
+
     /** Encrypted ciphertext stored on disk after a resumable download. */
     data class EncryptedFileOnDisk(
         val path: String,
@@ -1448,6 +1507,9 @@ object ApiClient {
         content: String,
         replyToId: Int? = null,
         clientMessageId: String? = null,
+        uploadedFileIds: List<String> = emptyList(),
+        fileBytes: ByteArray? = null,
+        filename: String? = null,
     ): ru.fromchat.api.schema.messages.Message {
         if (_suspensionState.value.isSuspended) {
             throw IllegalStateException("Account suspended")
@@ -1457,12 +1519,23 @@ object ApiClient {
                 content = content.trim(),
                 reply_to_id = replyToId,
                 client_message_id = clientMessageId?.trim()?.takeIf { it.isNotEmpty() },
+                uploaded_file_ids = uploadedFileIds.takeIf { it.isNotEmpty() },
             ),
         )
         val response = http.submitFormWithBinaryData(
             url = "${ServerConfig.apiBaseUrl}/send_message",
             formData = formData {
                 append("payload", payloadJson)
+                if (fileBytes != null && filename != null) {
+                    append(
+                        "files",
+                        fileBytes,
+                        Headers.build {
+                            append(HttpHeaders.ContentType, "application/octet-stream")
+                            append(HttpHeaders.ContentDisposition, "filename=\"$filename\"")
+                        },
+                    )
+                }
             },
         ).body<ru.fromchat.api.schema.messages.publicchat.SendMessageResponse>()
         if (!response.status.equals("success", ignoreCase = true)) {

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/AttachmentMediaLog.kt

@@ -22,6 +22,12 @@ object AttachmentMediaLog {
 
     fun persist(message: String, vararg fields: Pair<String, Any?>) = log("PERSIST", message, fields)
 
+    /** Image tile layout aspect ratio (upload → confirm). Filter: `adb logcat -s AttachmentMedia`. */
+    fun aspect(message: String, vararg fields: Pair<String, Any?>) = log("ASPECT", message, fields)
+
+    /** End-to-end outbound send timeline (tap → confirmed). Filter logcat: `AttachmentMedia`. */
+    fun send(message: String, vararg fields: Pair<String, Any?>) = log("SEND", message, fields)
+
     fun nowMs(): Long = Clock.System.now().toEpochMilliseconds()
 
     /** Short message text for download/upload log lines (not for UI). */

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/cache/AttachmentDiskThumbnail.kt

@@ -0,0 +1,14 @@
+package ru.fromchat.api.local.cache
+
+/** Matches server public-chat thumbnail long edge ([_THUMB_SIZE] in messaging.py). */
+const val ATTACHMENT_DISK_THUMB_MAX_EDGE_PX = 80
+
+/**
+ * Writes a tiny JPEG next to a cached full image for instant cold-start tiles.
+ * Returns true when [destAbsolutePath] exists after the call.
+ */
+expect fun generateAttachmentDiskThumbnail(
+    sourceAbsolutePath: String,
+    destAbsolutePath: String,
+    maxEdgePx: Int = ATTACHMENT_DISK_THUMB_MAX_EDGE_PX,
+): Boolean

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/cache/DecryptedFileCache.kt

@@ -46,7 +46,17 @@ object DecryptedFileCache {
         fileIndex: Int,
         clientMessageId: String? = null,
     ): String? {
-        val key = storageKey(messageId, fileIndex, clientMessageId)
+        val cid = clientMessageId?.trim()?.takeIf { it.isNotEmpty() }
+        if (cid != null) {
+            val clientKey = storageKey(-1, fileIndex, cid)
+            memoryCache[clientKey]?.takeIf { uriFileExists(it) }?.let { return it }
+            readDisk(clientKey)?.let { return it }
+        }
+        val key = if (messageId > 0) {
+            storageKey(messageId, fileIndex, null)
+        } else {
+            storageKey(messageId, fileIndex, cid)
+        }
         memoryCache[key]?.takeIf { uriFileExists(it) }?.let { return it }
         return readDisk(key)
     }
@@ -116,7 +126,7 @@ object DecryptedFileCache {
         val idKey = storageKey(messageId, fileIndex, null)
         if (getCached(messageId, fileIndex, null) != null) return
         val cid = clientMessageId?.trim()?.takeIf { it.isNotEmpty() } ?: return
-        val cidKey = storageKey(messageId, fileIndex, cid)
+        val cidKey = storageKey(-1, fileIndex, cid)
         val sourceUri = cacheMutex.withLock { resolveUriLocked(cidKey) }
             ?: readDisk(cidKey)
             ?: return
@@ -223,6 +233,170 @@ object DecryptedFileCache {
         }
     }
 
+    /**
+     * Downloads a plain (non-encrypted) public attachment into the file cache.
+     */
+    suspend fun getOrDownloadPlain(
+        messageId: Int,
+        fileIndex: Int,
+        file: DmFile,
+        clientMessageId: String? = null,
+        messageLabel: String? = null,
+    ): String? {
+        val key = storageKey(messageId, fileIndex, clientMessageId)
+        getCached(messageId, fileIndex, clientMessageId)?.let { return it }
+        cacheMutex.withLock { resolveUriLocked(key) }?.let { return it }
+
+        val label = AttachmentMediaLog.messageLabel(messageLabel)
+        AttachmentDownloadNotifier.beginDownload(
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+            mirrorAsFileAttachment = true,
+        )
+
+        return withContext(Dispatchers.Default) {
+            runCatching {
+                AttachmentDownloadScheduler.run(
+                    storageKey = key,
+                    messageId = messageId,
+                    keepAliveInBackground = true,
+                    work = {
+                        downloadPlainAndPersist(
+                            key = key,
+                            messageId = messageId,
+                            fileIndex = fileIndex,
+                            clientMessageId = clientMessageId,
+                            file = file,
+                            messageLabel = label,
+                        )
+                    },
+                )
+            }.onFailure { error ->
+                if (error !is CancellationException) {
+                    ApiClient.clearPartialEncryptedDownload(key)
+                }
+            }.getOrNull()
+        }
+    }
+
+    private suspend fun downloadPlainAndPersist(
+        key: String,
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String?,
+        file: DmFile,
+        messageLabel: String?,
+    ): String? {
+        ensureAttachmentDownloadActive(key)
+        cacheMutex.withLock { resolveUriLocked(key) }?.let { return it }
+
+        AttachmentDownloadNotifier.emit(
+            AttachmentDownloadProgress.InProgress(key, 1),
+            messageLabel = messageLabel,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+            mirrorAsFileAttachment = true,
+        )
+
+        val outputPath = diskPath(key, file.name)
+        if (outputPath == null) {
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+                mirrorAsFileAttachment = true,
+            )
+            return null
+        }
+
+        val downloaded = try {
+            ApiClient.fetchEncryptedFileResumable(
+                path = file.path,
+                resumeKey = key,
+                onProgress = { percent ->
+                    checkAttachmentDownloadActive(key)
+                    AttachmentDownloadNotifier.emit(
+                        AttachmentDownloadProgress.InProgress(key, percent.coerceIn(0, 100)),
+                        messageLabel = messageLabel,
+                        messageId = messageId,
+                        fileIndex = fileIndex,
+                        clientMessageId = clientMessageId,
+                        mirrorAsFileAttachment = true,
+                    )
+                },
+            )
+        } catch (error: CancellationException) {
+            throw error
+        } catch (error: Throwable) {
+            if (PlatformFileSystem.exists(outputPath)) {
+                PlatformFileSystem.delete(outputPath)
+            }
+            ApiClient.clearPartialEncryptedDownload(key)
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, error.message ?: "download_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+                mirrorAsFileAttachment = true,
+            )
+            return null
+        }
+
+        ensureAttachmentDownloadActive(key)
+        if (downloaded.path != outputPath) {
+            runCatching {
+                copyOutboundFileToPath("file://${downloaded.path}", outputPath)
+            }.onFailure {
+                ApiClient.clearPartialEncryptedDownload(key)
+                AttachmentDownloadNotifier.emit(
+                    AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                    messageLabel = messageLabel,
+                    messageId = messageId,
+                    fileIndex = fileIndex,
+                    clientMessageId = clientMessageId,
+                    mirrorAsFileAttachment = true,
+                )
+                return null
+            }
+        }
+        ApiClient.clearPartialEncryptedDownload(key)
+        val uri = cacheMutex.withLock {
+            resolveUriLocked(key) ?: commitCachePathLocked(key, outputPath)
+        }
+        if (uri == null) {
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+                mirrorAsFileAttachment = true,
+            )
+            return null
+        }
+        DownloadedFileRegistry.setExportUri(
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+            exportUri = uri,
+        )
+        AttachmentDownloadNotifier.emit(
+            AttachmentDownloadProgress.Success(storageKey = key, messageId = messageId),
+            messageLabel = messageLabel,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+            mirrorAsFileAttachment = true,
+        )
+        PendingFileSaveRegistry.onCacheReady(key)
+        return uri
+    }
+
     private suspend fun decryptAndPersist(
         key: String,
         messageId: Int,

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/cache/DecryptedImageCache.kt

@@ -19,6 +19,8 @@ import ru.fromchat.api.local.download.ensureAttachmentDownloadActive
 import ru.fromchat.ui.chat.utils.AttachmentDownloadVisibility
 import ru.fromchat.api.local.cache.DecryptedImageCache.storageKey
 import ru.fromchat.api.local.download.LocalDecodedImageCache
+import ru.fromchat.api.local.download.ChatPreviewDecodeSize
+import ru.fromchat.api.local.download.decodeLocalImageFile
 
 /**
  * Disk + in-memory cache for decrypted DM images.
@@ -26,6 +28,7 @@ import ru.fromchat.api.local.download.LocalDecodedImageCache
  */
 object DecryptedImageCache {
     private const val SUBDIR = "decrypted_images"
+    private const val DISK_THUMB_SUFFIX = "_thumb.jpg"
 
     /** True when [uri] points at a file under this cache (safe to persist for offline preview). */
     fun isDecryptedImageCacheUri(uri: String?): Boolean {
@@ -93,14 +96,101 @@ object DecryptedImageCache {
         clientMessageId: String? = null,
     ): String? {
         val cid = clientMessageId?.trim()?.takeIf { it.isNotEmpty() }
+        // Always try the client-id key first — outbound seeds live there until aliasing.
         if (cid != null) {
+            readDisk(storageKey(-1, fileIndex, cid))?.let { return it }
+        }
+        if (messageId > 0) {
+            readDisk(storageKey(messageId, fileIndex, null))?.let { return it }
+        } else {
             readDisk(storageKey(messageId, fileIndex, cid))?.let { return it }
         }
-        return readDisk(storageKey(messageId, fileIndex, null))
+        return null
     }
 
     fun getUriForStorageKey(storageKey: String): String? = readDisk(storageKey)
 
+    /** Synchronous lookup for the tiny on-disk JPEG written with the full cache file. */
+    fun getCachedThumbUri(
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String? = null,
+    ): String? {
+        for (lookupKey in progressLookupKeys(messageId, fileIndex, clientMessageId)) {
+            readThumbDisk(lookupKey)?.let { return it }
+        }
+        return null
+    }
+
+    suspend fun ensureDiskThumbIfNeeded(
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String? = null,
+    ) {
+        if (getCachedThumbUri(messageId, fileIndex, clientMessageId) != null) return
+        withContext(Dispatchers.Default) {
+            cacheMutex.withLock {
+                for (lookupKey in progressLookupKeys(messageId, fileIndex, clientMessageId)) {
+                    val thumbPath = thumbDiskPath(lookupKey) ?: continue
+                    if (PlatformFileSystem.exists(thumbPath)) return@withContext
+                    val fullPath = diskPath(lookupKey)?.takeIf { PlatformFileSystem.exists(it) }
+                        ?: continue
+                    writeDiskThumbLocked(lookupKey, fullPath)
+                    return@withContext
+                }
+            }
+        }
+    }
+
+    suspend fun decodePlaceholderThumb(
+        memoryKey: String,
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String?,
+        serverThumbBytes: ByteArray?,
+    ): androidx.compose.ui.graphics.ImageBitmap? = withContext(Dispatchers.Default) {
+        peekPlaceholderThumb(memoryKey, messageId, fileIndex, clientMessageId)?.let {
+            return@withContext it
+        }
+        // Prefer server base64 before generating a disk thumb from a huge full file.
+        val thumbBytes = serverThumbBytes?.takeIf { it.isNotEmpty() }
+        if (thumbBytes != null) {
+            val target = ChatPreviewDecodeSize(
+                ATTACHMENT_DISK_THUMB_MAX_EDGE_PX,
+                ATTACHMENT_DISK_THUMB_MAX_EDGE_PX,
+            )
+            LocalDecodedImageCache.loadThumb(memoryKey, thumbBytes, target)?.let {
+                return@withContext it
+            }
+        }
+        ensureDiskThumbIfNeeded(messageId, fileIndex, clientMessageId)
+        peekPlaceholderThumb(memoryKey, messageId, fileIndex, clientMessageId)
+    }
+
+    /** Sync disk/memory thumb for first composition (avoids empty tile before produceState). */
+    fun peekPlaceholderThumb(
+        memoryKey: String,
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String?,
+    ): androidx.compose.ui.graphics.ImageBitmap? {
+        LocalDecodedImageCache.peekThumb(memoryKey)?.let { return it }
+        getCachedThumbUri(messageId, fileIndex, clientMessageId)?.let { uri ->
+            val path = uri.removePrefix("file://")
+            if (path.isNotEmpty()) {
+                val target = ChatPreviewDecodeSize(
+                    ATTACHMENT_DISK_THUMB_MAX_EDGE_PX,
+                    ATTACHMENT_DISK_THUMB_MAX_EDGE_PX,
+                )
+                decodeLocalImageFile(path, target.widthPx, target.heightPx)?.let { bitmap ->
+                    LocalDecodedImageCache.putThumb(memoryKey, bitmap)
+                    return bitmap
+                }
+            }
+        }
+        return null
+    }
+
     fun messageIdFromStorageKey(storageKey: String): Int? {
         if (!storageKey.startsWith("img_") || storageKey.startsWith("img_c_")) return null
         return storageKey.removePrefix("img_").substringBefore('_').toIntOrNull()
@@ -116,7 +206,7 @@ object DecryptedImageCache {
         val idKey = storageKey(messageId, fileIndex, null)
         if (readDisk(idKey) != null) return
         val cid = clientMessageId?.trim()?.takeIf { it.isNotEmpty() } ?: return
-        val cidKey = storageKey(messageId, fileIndex, cid)
+        val cidKey = storageKey(-1, fileIndex, cid)
         val sourceUri = readDisk(cidKey) ?: return
         val bytes = runCatching {
             readOutboundFileBytes(sourceUri)
@@ -126,13 +216,16 @@ object DecryptedImageCache {
             cacheMutex.withLock {
                 if (readDisk(idKey) == null) {
                     writeCacheLocked(idKey, bytes)
-                    AttachmentMediaLog.diskCache(
-                        "alias_ok",
-                        "from" to cidKey,
-                        "to" to idKey,
-                        "bytes" to bytes.size,
-                    )
                 }
+                diskPath(idKey)?.let { fullPath ->
+                    writeDiskThumbLocked(idKey, fullPath)
+                }
+                AttachmentMediaLog.diskCache(
+                    "alias_ok",
+                    "from" to cidKey,
+                    "to" to idKey,
+                    "bytes" to bytes.size,
+                )
             }
         }
     }
@@ -234,6 +327,178 @@ object DecryptedImageCache {
         return uri
     }
 
+    /**
+     * Downloads a plain (non-encrypted) public attachment into the image cache.
+     * Reuses the resumable Range download path without decrypt.
+     */
+    suspend fun getOrDownloadPlain(
+        messageId: Int,
+        fileIndex: Int,
+        file: DmFile,
+        clientMessageId: String? = null,
+        messageLabel: String? = null,
+    ): String? {
+        val key = storageKey(messageId, fileIndex, clientMessageId)
+        getCached(messageId, fileIndex, clientMessageId)?.let { uri ->
+            AttachmentMediaLog.diskCache(
+                "getOrDownloadPlain_hit",
+                "key" to key,
+                "msgId" to messageId,
+                "uri" to uri,
+            )
+            return uri
+        }
+        cacheMutex.withLock { resolveUriLocked(key) }?.let { return it }
+
+        val label = AttachmentMediaLog.messageLabel(messageLabel)
+        AttachmentDownloadNotifier.beginDownload(
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+        )
+        val uri = withContext(Dispatchers.Default) {
+            runCatching {
+                AttachmentDownloadScheduler.run(
+                    storageKey = key,
+                    messageId = messageId,
+                    work = {
+                        downloadPlainAndPersist(
+                            key = key,
+                            messageId = messageId,
+                            fileIndex = fileIndex,
+                            clientMessageId = clientMessageId,
+                            file = file,
+                            messageLabel = label,
+                        )
+                    },
+                )
+            }.onFailure { error ->
+                if (error !is CancellationException) {
+                    ApiClient.clearPartialEncryptedDownload(key)
+                    AttachmentDownloadNotifier.emit(
+                        AttachmentDownloadProgress.Failed(
+                            storageKey = key,
+                            error = error.message ?: "download_failed",
+                        ),
+                        messageLabel = label,
+                        messageId = messageId,
+                        fileIndex = fileIndex,
+                        clientMessageId = clientMessageId,
+                    )
+                }
+            }.getOrNull()
+        }
+        if (uri != null && messageId > 0) {
+            ensureDiskAliasForMessageId(messageId, fileIndex, clientMessageId)
+        }
+        return uri
+    }
+
+    private suspend fun downloadPlainAndPersist(
+        key: String,
+        messageId: Int,
+        fileIndex: Int,
+        clientMessageId: String?,
+        file: DmFile,
+        messageLabel: String?,
+    ): String? {
+        ensureAttachmentDownloadActive(key)
+        cacheMutex.withLock { resolveUriLocked(key) }?.let { return it }
+        AttachmentDownloadNotifier.emit(
+            AttachmentDownloadProgress.InProgress(key, 1),
+            messageLabel = messageLabel,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+        )
+        val t0 = AttachmentMediaLog.nowMs()
+        val outputPath = diskPath(key)
+        if (outputPath == null) {
+            ApiClient.clearPartialEncryptedDownload(key)
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+            )
+            return null
+        }
+        val downloaded = runCatching {
+            ApiClient.fetchEncryptedFileResumable(
+                path = file.path,
+                resumeKey = key,
+                onProgress = { percent ->
+                    checkAttachmentDownloadActive(key)
+                    AttachmentDownloadNotifier.emit(
+                        AttachmentDownloadProgress.InProgress(key, percent.coerceIn(0, 100)),
+                        messageLabel = messageLabel,
+                        messageId = messageId,
+                        fileIndex = fileIndex,
+                        clientMessageId = clientMessageId,
+                    )
+                },
+            )
+        }.onFailure { error ->
+            if (error is CancellationException) throw error
+            ApiClient.clearPartialEncryptedDownload(key)
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, error.message ?: "download_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+            )
+        }.getOrNull() ?: return null
+
+        ensureAttachmentDownloadActive(key)
+        if (downloaded.path != outputPath) {
+            runCatching {
+                copyOutboundFileToPath("file://${downloaded.path}", outputPath)
+            }.onFailure {
+                ApiClient.clearPartialEncryptedDownload(key)
+                AttachmentDownloadNotifier.emit(
+                    AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                    messageLabel = messageLabel,
+                    messageId = messageId,
+                    fileIndex = fileIndex,
+                    clientMessageId = clientMessageId,
+                )
+                return null
+            }
+        }
+        ApiClient.clearPartialEncryptedDownload(key)
+        val uri = cacheMutex.withLock {
+            resolveUriLocked(key) ?: commitCachePathLocked(key, outputPath)
+        }
+        if (uri == null) {
+            AttachmentDownloadNotifier.emit(
+                AttachmentDownloadProgress.Failed(key, "cache_write_failed"),
+                messageLabel = messageLabel,
+                messageId = messageId,
+                fileIndex = fileIndex,
+                clientMessageId = clientMessageId,
+            )
+            return null
+        }
+        AttachmentMediaLog.download(
+            "plain_persist_ok",
+            "key" to key,
+            "bytes" to downloaded.sizeBytes,
+            "ms" to (AttachmentMediaLog.nowMs() - t0),
+            "uri" to uri,
+            "msg" to messageLabel,
+        )
+        AttachmentDownloadNotifier.emit(
+            AttachmentDownloadProgress.Success(storageKey = key, messageId = messageId),
+            messageLabel = messageLabel,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = clientMessageId,
+        )
+        return uri
+    }
+
     suspend fun invalidateForMessage(messageId: Int) {
         val dir = ensureCacheDir() ?: return
         withContext(Dispatchers.Default) {
@@ -272,6 +537,7 @@ object DecryptedImageCache {
         withContext(Dispatchers.Default) {
             cacheMutex.withLock { memoryCache.remove(key) }
             diskPath(key)?.let { invalidatePath(it) }
+            thumbDiskPath(key)?.let { invalidatePath(it) }
             LocalDecodedImageCache.evict(key)
         }
     }
@@ -470,6 +736,23 @@ object DecryptedImageCache {
         return "$dir/$storageKey"
     }
 
+    private fun thumbDiskPath(storageKey: String): String? {
+        val dir = ensureCacheDir() ?: return null
+        return "$dir/$storageKey$DISK_THUMB_SUFFIX"
+    }
+
+    private fun readThumbDisk(storageKey: String): String? {
+        val path = thumbDiskPath(storageKey) ?: return null
+        if (!PlatformFileSystem.exists(path)) return null
+        return "file://$path"
+    }
+
+    private fun writeDiskThumbLocked(storageKey: String, sourceAbsolutePath: String) {
+        val dest = thumbDiskPath(storageKey) ?: return
+        if (PlatformFileSystem.exists(dest)) return
+        generateAttachmentDiskThumbnail(sourceAbsolutePath, dest, ATTACHMENT_DISK_THUMB_MAX_EDGE_PX)
+    }
+
     private fun readDisk(storageKey: String): String? {
         val path = diskPath(storageKey) ?: return null
         if (!PlatformFileSystem.exists(path)) return null
@@ -484,6 +767,7 @@ object DecryptedImageCache {
             if (!PlatformFileSystem.exists(path)) return null
             val uri = "file://$path"
             memoryCache[storageKey] = uri
+            writeDiskThumbLocked(storageKey, path)
             uri
         }.getOrElse {
             invalidatePath(path)
@@ -495,6 +779,7 @@ object DecryptedImageCache {
         if (!PlatformFileSystem.exists(path)) return null
         val uri = "file://$path"
         memoryCache[storageKey] = uri
+        writeDiskThumbLocked(storageKey, path)
         return uri
     }
 

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/cache/ResumableUploadStorage.kt

@@ -39,6 +39,36 @@ interface OutboundFileInputStream {
     suspend fun close()
 }
 
+/** Reads [length] bytes from [fileUri] starting at [offset] (seek via skip/read). */
+suspend fun readOutboundFileRange(fileUri: String, offset: Long, length: Int): ByteArray {
+    if (length <= 0) return ByteArray(0)
+    val input = openOutboundFileInputStream(fileUri)
+        ?: throw OutboundFileUnavailableException("Cannot open outbound file")
+    try {
+        var remaining = offset.coerceAtLeast(0L)
+        val skipBuf = ByteArray(8192)
+        while (remaining > 0L) {
+            val toRead = minOf(skipBuf.size.toLong(), remaining).toInt()
+            val n = input.read(skipBuf, 0, toRead)
+            if (n <= 0) throw OutboundFileUnavailableException("Unexpected EOF while seeking")
+            remaining -= n.toLong()
+        }
+        val buffer = ByteArray(length)
+        var read = 0
+        while (read < length) {
+            val n = input.read(buffer, read, length - read)
+            if (n <= 0) break
+            read += n
+        }
+        if (read < length) {
+            throw OutboundFileUnavailableException("Outbound file truncated")
+        }
+        return buffer
+    } finally {
+        input.close()
+    }
+}
+
 expect suspend fun saveEncryptedUploadBlob(instanceId: String, clientMessageId: String, bytes: ByteArray)
 
 expect suspend fun loadEncryptedUploadBlob(instanceId: String, clientMessageId: String): ByteArray?

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/db/DmStoredMessageContent.kt

@@ -10,9 +10,12 @@ import kotlinx.serialization.json.jsonArray
 import kotlinx.serialization.json.jsonObject
 import kotlinx.serialization.json.jsonPrimitive
 import ru.fromchat.api.schema.messages.Message
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
 import ru.fromchat.api.schema.messages.dm.DmEnvelope
+import ru.fromchat.api.schema.messages.dm.DmFile
 import ru.fromchat.api.local.AttachmentMediaLog
 import ru.fromchat.api.local.cache.DecryptedImageCache
+import ru.fromchat.api.local.download.readLocalImageDimensions
 
 private val json = Json { ignoreUnknownKeys = true; encodeDefaults = true }
 
@@ -50,15 +53,30 @@ private data class PersistedDmMessagePayload(
     @SerialName("localPreviewUri") val localPreviewUri: String? = null,
 )
 
+@Serializable
+private data class PersistedPublicMessagePayload(
+    @SerialName("text") val text: String,
+    @SerialName("files") val files: List<DmFile>,
+    @SerialName("fileThumbnails") val fileThumbnails: List<String>? = null,
+    @SerialName("fileAspectRatios") val fileAspectRatios: List<Float>? = null,
+    @SerialName("fileSizes") val fileSizes: List<Long>? = null,
+    @SerialName("fileDimensions") val fileDimensions: List<List<Int>>? = null,
+    /** Canonical API [width, height] pairs — survives reopen without network. */
+    @SerialName("fileAspectRatioPairs") val fileAspectRatioPairs: List<List<Int>>? = null,
+    @SerialName("localPreviewUri") val localPreviewUri: String? = null,
+)
+
 data class ParsedDmMessageContent(
     val text: String,
     /** Reply target from encrypted JSON payload (`reply_to_id`), when present. */
     val replyToId: Int? = null,
     val envelope: DmEnvelope? = null,
+    val files: List<DmFile>? = null,
     val fileThumbnails: List<String>? = null,
     val fileAspectRatios: List<Float>? = null,
     val fileSizes: List<Long>? = null,
     val fileDimensions: List<Pair<Int, Int>>? = null,
+    val fileAspectRatioPairs: List<List<Int>>? = null,
     val isContentCorrupted: Boolean = false,
     val localPreviewUri: String? = null,
     val pendingFileUri: String? = null,
@@ -114,6 +132,65 @@ fun resolveLocalPreviewUri(message: Message): String? {
     return null
 }
 
+/** Sync disk lookup for cold-start chat open (no suspend alias copy). */
+fun hydrateAttachmentPreviewFromDiskSync(message: Message): Message {
+    val previewUri = resolveLocalPreviewUri(message) ?: return hydrateDiskAspectRatioSync(message)
+    val withPreview = if (message.pendingFileUri == previewUri) {
+        message
+    } else {
+        message.copy(pendingFileUri = previewUri)
+    }
+    return hydrateDiskAspectRatioSync(withPreview)
+}
+
+private fun hydrateDiskAspectRatioSync(message: Message): Message {
+    val file = message.files?.firstOrNull() ?: return message
+    if (!isImageAttachmentFilename(file.name)) return message
+    if (messageHasLayoutAspect(message)) return message
+    val aspect = readDiskAspectRatioForMessage(message) ?: return message
+    return message.copy(pendingFileAspectRatio = aspect)
+}
+
+private fun isImageAttachmentFilename(name: String): Boolean =
+    name.endsWith(".png", true) || name.endsWith(".jpg", true) ||
+        name.endsWith(".jpeg", true) || name.endsWith(".gif", true) || name.endsWith(".webp", true)
+
+private fun messageHasLayoutAspect(message: Message): Boolean {
+    message.fileAspectRatioPairs?.firstOrNull()?.takeIf { it.size >= 2 }?.let { pair ->
+        val w = pair[0]
+        val h = pair[1]
+        if (w > 0 && h > 0 && !isPlaceholderAttachmentDimensions(w, h)) return true
+    }
+    message.fileDimensions?.firstOrNull()?.let { (w, h) ->
+        if (w > 0 && h > 0 && !isPlaceholderAttachmentDimensions(w, h)) return true
+    }
+    message.fileAspectRatios?.firstOrNull()?.takeIf { !isPlaceholderAttachmentAspectRatio(it) }?.let {
+        return true
+    }
+    message.pendingFileAspectRatio?.takeIf { it > 0f && !isPlaceholderAttachmentAspectRatio(it) }?.let {
+        return true
+    }
+    return false
+}
+
+private fun readDiskAspectRatioForMessage(message: Message): Float? {
+    val paths = buildList {
+        DecryptedImageCache.getCachedThumbUri(message.id, 0, message.client_message_id)
+            ?.removePrefix("file://")
+            ?.takeIf { it.isNotEmpty() }
+            ?.let(::add)
+        message.pendingFileUri?.removePrefix("file://")?.takeIf { it.isNotEmpty() }?.let(::add)
+        resolveLocalPreviewUri(message)?.removePrefix("file://")?.takeIf { it.isNotEmpty() }?.let(::add)
+    }.distinct()
+    for (path in paths) {
+        if (!localPreviewFileExists("file://$path")) continue
+        val (w, h) = readLocalImageDimensions(path) ?: continue
+        if (w <= 0 || h <= 0 || isPlaceholderAttachmentDimensions(w, h)) continue
+        return aspectRatioFromDimensionPair(w, h)
+    }
+    return null
+}
+
 /**
  * Layout width/height. Pixel pairs keep [w,h] order (landscape vs portrait).
  * Do not min/max swap — that forces every landscape 4K image into portrait.
@@ -128,6 +205,12 @@ internal fun aspectRatioFromDimensionPair(w: Int, h: Int): Float {
     return dw.toFloat() / dh.toFloat()
 }
 
+/** Server fallback when thumb meta is missing (e.g. very large images). */
+internal fun isPlaceholderAttachmentDimensions(w: Int, h: Int): Boolean = w == 1 && h == 1
+
+internal fun isPlaceholderAttachmentAspectRatio(ratio: Float): Boolean =
+    ratio in 0.999f..1.001f
+
 private fun localPreviewFileExists(uri: String): Boolean {
     val path = uri.removePrefix("file://")
     return path.isNotEmpty() && PlatformFileSystem.exists(path)
@@ -158,6 +241,33 @@ fun encodePersistedDmMessage(message: Message): String {
     return json.encodeToString(payload)
 }
 
+fun encodePersistedPublicMessage(message: Message): String {
+    val laidOut = message.resolvePublicAttachmentLayout()
+    val files = laidOut.files?.takeIf { it.isNotEmpty() } ?: return laidOut.content
+    val dims = laidOut.fileDimensions?.map { listOf(it.first, it.second) }
+    val pairs = laidOut.fileAspectRatioPairs
+    val payload = PersistedPublicMessagePayload(
+        text = laidOut.content,
+        files = files,
+        fileThumbnails = laidOut.fileThumbnails,
+        fileAspectRatios = laidOut.fileAspectRatios,
+        fileSizes = laidOut.fileSizes,
+        fileDimensions = dims,
+        fileAspectRatioPairs = pairs,
+        localPreviewUri = resolveLocalPreviewUri(laidOut),
+    )
+    AttachmentMediaLog.persist(
+        "encode_public",
+        "msgId" to laidOut.id,
+        "clientId" to laidOut.client_message_id,
+        "files" to files.size,
+        "localPreview" to (payload.localPreviewUri?.take(64) ?: "null"),
+        "dims" to (dims?.firstOrNull()?.joinToString("x") ?: "null"),
+        "pairs" to (pairs?.firstOrNull()),
+    )
+    return json.encodeToString(payload)
+}
+
 fun parseDmMessageContent(plaintext: String): ParsedDmMessageContent {
     val trimmed = plaintext.trim()
     if (trimmed.startsWith("{")) {
@@ -194,6 +304,7 @@ fun parseDmMessageContent(plaintext: String): ParsedDmMessageContent {
                 ParsedDmMessageContent(
                     text = payload.text,
                     envelope = payload.envelope,
+                    files = payload.envelope.files,
                     fileThumbnails = payload.fileThumbnails,
                     fileAspectRatios = payload.fileAspectRatios,
                     fileSizes = payload.fileSizes,
@@ -207,6 +318,26 @@ fun parseDmMessageContent(plaintext: String): ParsedDmMessageContent {
                 ParsedDmMessageContent(text = plaintext)
             }
         }
+        val isPersistedPublic = root?.containsKey("files") == true
+        if (isPersistedPublic) {
+            return runCatching {
+                val payload = json.decodeFromString<PersistedPublicMessagePayload>(trimmed)
+                ParsedDmMessageContent(
+                    text = payload.text,
+                    files = payload.files,
+                    fileThumbnails = payload.fileThumbnails,
+                    fileAspectRatios = payload.fileAspectRatios,
+                    fileSizes = payload.fileSizes,
+                    fileDimensions = payload.fileDimensions?.mapNotNull { pair ->
+                        if (pair.size >= 2) pair[0] to pair[1] else null
+                    },
+                    fileAspectRatioPairs = payload.fileAspectRatioPairs,
+                    localPreviewUri = payload.localPreviewUri?.takeIf { localPreviewFileExists(it) },
+                )
+            }.getOrElse {
+                ParsedDmMessageContent(text = plaintext)
+            }
+        }
         return parseLegacyDmContentJson(trimmed)
     }
     return ParsedDmMessageContent(text = trimmed)

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/db/store/MessageCacheStore.kt

@@ -24,15 +24,19 @@ import ru.fromchat.api.local.messages.conversationIdForGroup
 import ru.fromchat.api.local.messages.dmOtherUserIdFromConversationId
 import ru.fromchat.api.local.db.encodeOptimisticOutboundMessage
 import ru.fromchat.api.local.db.encodePersistedDmMessage
+import ru.fromchat.api.local.db.encodePersistedPublicMessage
 import ru.fromchat.api.local.db.parseDmMessageContent
+import ru.fromchat.api.local.db.hydrateAttachmentPreviewFromDiskSync
 import ru.fromchat.api.local.db.resolveLocalPreviewUri
 import ru.fromchat.api.local.messages.sortMessagesForChatDisplay
 import ru.fromchat.api.local.send.DmAttachmentOutboxPayload
+import ru.fromchat.api.local.send.PublicAttachmentOutboxPayload
 import ru.fromchat.api.local.send.SEND_ERROR_FAILED
 import ru.fromchat.api.local.send.OutgoingMessageCoordinator
 import ru.fromchat.api.schema.messages.Message
 import ru.fromchat.api.schema.messages.dm.DmConversation
 import ru.fromchat.api.schema.messages.dm.DmEnvelope
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
 import ru.fromchat.api.local.cache.CacheContext
 import ru.fromchat.api.local.cache.CacheValidator
 import ru.fromchat.db.Conversation
@@ -42,6 +46,7 @@ import ru.fromchat.api.local.cache.DecryptedFileCache
 import ru.fromchat.api.local.cache.DecryptedImageCache
 import ru.fromchat.api.local.download.DownloadedFileRegistry
 import ru.fromchat.ui.chat.utils.attachPublicReplyReferences
+import ru.fromchat.ui.chat.isImageFilename
 import ru.fromchat.ui.chat.utils.dedupeMessagesByClientId
 import ru.fromchat.ui.chat.utils.dropSupersededOptimisticMessages
 import kotlin.concurrent.Volatile
@@ -74,22 +79,29 @@ object MessageCacheStore {
         return if (t.length > maxLen) t.take(maxLen) + "\u2026" else t
     }
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     fun observeMessages(instanceId: String, conversationId: String): Flow<List<Message>> =
         db.messageDatabaseQueries
             .selectMessagesByConversation(instanceId, conversationId)
             .asFlow()
             .mapToList(Dispatchers.Default)
-            .map { rows ->
-                val raw = hydrateReplyReferencesFromRows(rows)
-                val withoutSuperseded = dropSupersededOptimisticMessages(raw, ApiClient.user?.id)
-                sortMessagesForChatDisplay(
-                    validatedOrEmpty(
-                        conversationId,
-                        dedupeMessagesByClientId(
-                            enrichQueuedOutboundUi(withoutSuperseded, conversationId),
+            .mapLatest { rows ->
+                withContext(Dispatchers.Default) {
+                    val raw = hydrateReplyReferencesFromRows(rows)
+                    val withoutSuperseded = dropSupersededOptimisticMessages(raw, ApiClient.user?.id)
+                    val hydrated = hydrateAttachmentPreviewsFromDisk(withoutSuperseded)
+                    sortMessagesForChatDisplay(
+                        validatedOrEmpty(
+                            conversationId,
+                            dedupeMessagesByClientId(
+                                enrichQueuedOutboundUi(
+                                    hydrated,
+                                    conversationId,
+                                ),
+                            ),
                         ),
-                    ),
-                )
+                    )
+                }
             }
 
     suspend fun loadPublicMessages(): List<Message> =
@@ -106,12 +118,13 @@ object MessageCacheStore {
             .executeAsList()
         val raw = hydrateReplyReferencesFromRows(rows).reversed()
         val withoutSuperseded = dropSupersededOptimisticMessages(raw, ApiClient.user?.id)
+        val withDiskPreviews = withoutSuperseded.map { hydrateAttachmentPreviewFromDiskSync(it) }
         return ProfileCache.enrichPublicMessagesForDisplay(
             sortMessagesForChatDisplay(
                 validatedOrEmpty(
                     convId,
                     dedupeMessagesByClientId(
-                        enrichQueuedOutboundUi(withoutSuperseded, convId),
+                        enrichQueuedOutboundUi(withDiskPreviews, convId),
                     ),
                 ),
             ),
@@ -153,15 +166,16 @@ object MessageCacheStore {
     }
 
     suspend fun replacePublicMessages(messages: List<Message>) {
-        ProfileCache.mergePreviewFromPublicMessages(messages)
+        val resolved = messages.map { it.resolvePublicAttachmentLayout() }
+        ProfileCache.mergePreviewFromPublicMessages(resolved)
         conversationIdForPublic().let {
             replaceMessages(
                 it,
                 sortMessagesForChatDisplay(
                     dedupeMessagesByClientId(
-                        messages + loadPendingMessages(it).filter { p ->
+                        resolved + loadPendingMessages(it).filter { p ->
                             val cid = p.client_message_id
-                            cid == null || messages.none { it.client_message_id == cid }
+                            cid == null || resolved.none { it.client_message_id == cid }
                         }
                     )
                 )
@@ -230,8 +244,9 @@ object MessageCacheStore {
     }
 
     suspend fun upsertPublicMessage(message: Message) {
-        ProfileCache.mergePreviewFromPublicMessage(message)
-        upsertSingle(conversationIdForPublic(), message)
+        val resolved = message.resolvePublicAttachmentLayout()
+        ProfileCache.mergePreviewFromPublicMessage(resolved)
+        upsertSingle(conversationIdForPublic(), resolved)
     }
 
     suspend fun markSendFailed(conversationId: String, clientMessageId: String) {
@@ -286,14 +301,50 @@ object MessageCacheStore {
     }
 
     suspend fun confirmPublicMessage(clientMessageId: String, confirmed: Message) {
-        ProfileCache.mergePreviewFromPublicMessage(confirmed)
-        confirmMessage(conversationIdForPublic(), clientMessageId, confirmed)
+        withContext(Dispatchers.Default) {
+            var resolved = confirmed.resolvePublicAttachmentLayout()
+            resolved = hydrateAttachmentPreviewFromDisk(resolved)
+            ProfileCache.mergePreviewFromPublicMessage(resolved)
+            confirmMessage(conversationIdForPublic(), clientMessageId, resolved)
+        }
     }
 
     suspend fun confirmDmMessage(otherUserId: Int, clientMessageId: String, confirmed: Message) {
         confirmMessage(conversationIdForDm(otherUserId), clientMessageId, confirmed)
     }
 
+    /** After download/decrypt, persist [localPreviewUri] so reopen skips network. */
+    suspend fun patchPublicMessageLocalPreview(
+        messageId: Int,
+        localPreviewUri: String,
+    ) {
+        if (messageId <= 0 || !DecryptedImageCache.isDecryptedImageCacheUri(localPreviewUri)) return
+        val convId = conversationIdForPublic()
+        val iid = instanceId()
+        withContext(Dispatchers.Default) {
+            val row = db.messageDatabaseQueries
+                .selectMessageById(iid, convId, messageId.toLong())
+                .executeAsOneOrNull() ?: return@withContext
+            val msg = row.toAppMessage().copy(pendingFileUri = localPreviewUri)
+            if (msg.files.isNullOrEmpty() || msg.dmEnvelope != null) return@withContext
+            val laidOut = msg.resolvePublicAttachmentLayout()
+            db.messageDatabaseQueries.upsertMessage(
+                instanceId = iid,
+                id = laidOut.id.toLong(),
+                conversationId = convId,
+                userId = laidOut.user_id.toLong(),
+                content = encodePersistedPublicMessage(laidOut),
+                timestamp = laidOut.timestamp,
+                isRead = if (laidOut.is_read) 1L else 0L,
+                isEdited = if (laidOut.is_edited) 1L else 0L,
+                replyToId = resolveReplyToIdForPersistence(laidOut, row.replyToId),
+                clientMessageId = laidOut.client_message_id,
+                deletedFlag = 0L,
+                sendStatus = "sent",
+            )
+        }
+    }
+
     /** After decrypt, persist [localPreviewUri] so reopen skips network. */
     suspend fun patchDmMessageLocalPreview(
         otherUserId: Int,
@@ -856,7 +907,12 @@ object MessageCacheStore {
 
     private suspend fun confirmMessage(conversationId: String, clientMessageId: String, confirmed: Message) {
         val iid = instanceId()
-        val storedContent = encodePersistedDmMessage(confirmed)
+        val storedContent = when {
+            !confirmed.files.isNullOrEmpty() && confirmed.dmEnvelope != null ->
+                encodePersistedDmMessage(confirmed)
+            !confirmed.files.isNullOrEmpty() -> encodePersistedPublicMessage(confirmed)
+            else -> confirmed.content
+        }
         withContext(Dispatchers.Default) {
             db.messageDatabaseQueries.transaction {
                 val existingReplyToId = db.messageDatabaseQueries
@@ -901,7 +957,10 @@ object MessageCacheStore {
                 validatedOrEmpty(
                     conversationId,
                     dedupeMessagesByClientId(
-                        enrichQueuedOutboundUi(withoutSuperseded, conversationId),
+                        enrichQueuedOutboundUi(
+                            hydrateAttachmentPreviewsFromDisk(withoutSuperseded),
+                            conversationId,
+                        ),
                     ),
                 ),
             )
@@ -915,6 +974,7 @@ object MessageCacheStore {
                 .selectRecentMessagesByConversation(iid, conversationId, limit)
                 .executeAsList()
             hydrateReplyReferencesFromRows(rows).reversed()
+                .let { hydrateAttachmentPreviewsFromDisk(it) }
         }
     }
 
@@ -951,7 +1011,9 @@ object MessageCacheStore {
                 it.conversationId == conversationId &&
                     (
                         it.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT ||
-                            it.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT_AWAITING_ACK
+                            it.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT_AWAITING_ACK ||
+                            it.kind == OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT ||
+                            it.kind == OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK
                         )
             }
         if (attachmentOutbox.isEmpty()) return messages
@@ -961,11 +1023,33 @@ object MessageCacheStore {
             .toSet()
         val payloads = attachmentOutbox.associate { row ->
             row.clientMessageId to runCatching {
-                Triple(
-                    outboxJson.decodeFromString<DmAttachmentOutboxPayload>(row.payloadJson),
-                    row.bytesUploaded,
-                    row.kind,
-                )
+                when (row.kind) {
+                    OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT,
+                    OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK -> {
+                        val payload = outboxJson.decodeFromString<PublicAttachmentOutboxPayload>(row.payloadJson)
+                        AttachmentOutboxUi(
+                            fileUri = payload.fileUri,
+                            filename = payload.filename,
+                            fileSizeBytes = payload.fileSizeBytes,
+                            aspectRatio = payload.aspectRatio,
+                            encryptedFileSizeBytes = 0L,
+                            bytesUploaded = row.bytesUploaded,
+                            kind = row.kind,
+                        )
+                    }
+                    else -> {
+                        val payload = outboxJson.decodeFromString<DmAttachmentOutboxPayload>(row.payloadJson)
+                        AttachmentOutboxUi(
+                            fileUri = payload.fileUri,
+                            filename = payload.filename,
+                            fileSizeBytes = payload.fileSizeBytes,
+                            aspectRatio = payload.aspectRatio,
+                            encryptedFileSizeBytes = payload.encryptedFileSizeBytes,
+                            bytesUploaded = row.bytesUploaded,
+                            kind = row.kind,
+                        )
+                    }
+                }
             }.getOrNull()
         }
         return messages.mapNotNull { msg ->
@@ -974,32 +1058,43 @@ object MessageCacheStore {
             if (cid.isNotEmpty() && cid in confirmedClientIds) return@mapNotNull null
             if (cid.isEmpty()) return@mapNotNull msg
             val entry = payloads[cid] ?: return@mapNotNull msg
-            val (payload, bytesUploaded, kind) = entry
-            val uploadFinished = kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT_AWAITING_ACK
+            val uploadFinished =
+                entry.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT_AWAITING_ACK ||
+                    entry.kind == OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK
             val totalBytes = when {
-                payload.encryptedFileSizeBytes > 0L -> payload.encryptedFileSizeBytes
-                else -> payload.fileSizeBytes
+                entry.encryptedFileSizeBytes > 0L -> entry.encryptedFileSizeBytes
+                else -> entry.fileSizeBytes
             }
             val percent = when {
                 uploadFinished -> null
-                totalBytes > 0L && bytesUploaded > 0L ->
-                    ((bytesUploaded.toDouble() / totalBytes.toDouble()) * 100.0).toInt().coerceIn(0, 99)
-                bytesUploaded > 0L -> 1
+                totalBytes > 0L && entry.bytesUploaded > 0L ->
+                    ((entry.bytesUploaded.toDouble() / totalBytes.toDouble()) * 100.0).toInt().coerceIn(0, 99)
+                entry.bytesUploaded > 0L -> 1
                 else -> msg.uploadProgress ?: 0
             }
             msg.copy(
-                pendingFileUri = payload.fileUri,
-                pendingFilename = payload.filename,
-                pendingFileAspectRatio = payload.aspectRatio?.takeIf { it > 0f }
+                pendingFileUri = entry.fileUri,
+                pendingFilename = entry.filename,
+                pendingFileAspectRatio = entry.aspectRatio?.takeIf { it > 0f }
                     ?: msg.pendingFileAspectRatio,
                 uploadJobId = cid,
                 uploadProgress = percent,
                 fileSizes = msg.fileSizes
-                    ?: payload.fileSizeBytes.takeIf { it > 0L }?.let { listOf(it) },
+                    ?: entry.fileSizeBytes.takeIf { it > 0L }?.let { listOf(it) },
             )
         }
     }
 
+    private data class AttachmentOutboxUi(
+        val fileUri: String,
+        val filename: String,
+        val fileSizeBytes: Long,
+        val aspectRatio: Float?,
+        val encryptedFileSizeBytes: Long,
+        val bytesUploaded: Long,
+        val kind: String,
+    )
+
     private fun purgeSupersededPendingRows(
         instanceId: String,
         conversationId: String,
@@ -1088,15 +1183,16 @@ object MessageCacheStore {
             reply_to = null,
             client_message_id = clientMessageId,
             reactions = null,
-            files = parsed.envelope?.files,
+            files = parsed.files ?: parsed.envelope?.files,
             dmEnvelope = parsed.envelope,
             fileThumbnails = parsed.fileThumbnails,
             fileAspectRatios = parsed.fileAspectRatios,
             fileSizes = parsed.fileSizes,
             fileDimensions = parsed.fileDimensions,
+            fileAspectRatioPairs = parsed.fileAspectRatioPairs,
             isContentCorrupted = parsed.isContentCorrupted,
         )
-        return base.copy(
+        val hydrated = base.copy(
             pendingFileUri = parsed.pendingFileUri
                 ?: parsed.localPreviewUri
                 ?: resolveLocalPreviewUri(base),
@@ -1109,11 +1205,36 @@ object MessageCacheStore {
                 },
             uploadError = if (sendStatus == "failed") SEND_ERROR_FAILED else null,
         )
+        return if (!hydrated.files.isNullOrEmpty() && hydrated.dmEnvelope == null) {
+            hydrated.resolvePublicAttachmentLayout()
+        } else {
+            hydrated
+        }
     }
 
+    private suspend fun ensureAttachmentDiskAlias(message: Message) {
+        val cid = message.client_message_id?.trim()?.takeIf { it.isNotEmpty() } ?: return
+        if (message.id <= 0) return
+        val file = message.files?.firstOrNull() ?: return
+        if (isImageFilename(file.name)) {
+            DecryptedImageCache.ensureDiskAliasForMessageId(message.id, 0, cid)
+        } else if (message.dmEnvelope != null) {
+            DecryptedFileCache.ensureDiskAliasForMessageId(message.id, 0, cid)
+        }
+    }
+
+    private suspend fun hydrateAttachmentPreviewFromDisk(message: Message): Message {
+        ensureAttachmentDiskAlias(message)
+        return hydrateAttachmentPreviewFromDiskSync(message)
+    }
+
+    private suspend fun hydrateAttachmentPreviewsFromDisk(messages: List<Message>): List<Message> =
+        messages.map { hydrateAttachmentPreviewFromDisk(it) }
+
     private fun storedMessageContent(msg: Message): String = when {
         msg.id < 0 -> encodeOptimisticOutboundMessage(msg)
         !msg.files.isNullOrEmpty() && msg.dmEnvelope != null -> encodePersistedDmMessage(msg)
+        !msg.files.isNullOrEmpty() -> encodePersistedPublicMessage(msg)
         else -> msg.content
     }
 

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/download/LocalDecodedImageCache.kt

@@ -121,6 +121,10 @@ object LocalDecodedImageCache {
         return bitmap
     }
 
+    fun putThumb(storageKey: String, bitmap: ImageBitmap) {
+        PlatformDecodedBitmapCache.put(storageKey + THUMB_SUFFIX, bitmap)
+    }
+
     fun evict(storageKey: String) {
         PlatformDecodedBitmapCache.remove(previewCacheKey(storageKey))
         PlatformDecodedBitmapCache.remove(fullscreenCacheKey(storageKey))

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/download/LocalImageFileDimensions.kt

@@ -0,0 +1,4 @@
+package ru.fromchat.api.local.download
+
+/** EXIF-oriented width/height from a local file (bounds read only; no full decode). */
+internal expect fun readLocalImageDimensions(absolutePath: String): Pair<Int, Int>?

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/download/MessageImageSave.kt

@@ -11,6 +11,8 @@ import ru.fromchat.api.schema.messages.Message
 import ru.fromchat.api.local.cache.readOutboundFileBytes
 import ru.fromchat.api.local.mimeTypeForFilename
 import ru.fromchat.ui.chat.isImageFilename
+import ru.fromchat.ui.chat.utils.attachmentDecodeCacheKeys
+import ru.fromchat.ui.chat.utils.peekDecodedAttachmentBitmap
 
 data class SavableMessageImage(
     val fileIndex: Int,
@@ -25,13 +27,20 @@ fun mimeTypeForImageFilename(filename: String): String = mimeTypeForFilename(fil
 fun isMessageImageFullyLoaded(message: Message, fileIndex: Int): Boolean {
     val file = message.files?.getOrNull(fileIndex)
     if (file != null && isImageFilename(file.name)) {
-        if (message.dmEnvelope != null) {
-            return DecryptedImageCache.getCached(
+        val cacheKeys = attachmentDecodeCacheKeys(
+            messageId = message.id,
+            fileIndex = fileIndex,
+            clientMessageId = message.client_message_id,
+        )
+        if (DecryptedImageCache.getCached(
                 messageId = message.id,
                 fileIndex = fileIndex,
                 clientMessageId = message.client_message_id,
             ) != null
+        ) {
+            return true
         }
+        if (peekDecodedAttachmentBitmap(cacheKeys) != null) return true
         return false
     }
     if (fileIndex != 0) return false

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/DmAttachmentOutboxHandler.kt

@@ -557,6 +557,9 @@ object DmAttachmentOutboxHandler {
             MessageDatabaseProvider.database.messageDatabaseQueries
                 .selectPendingOutboxForInstance(instanceId)
                 .executeAsList()
-                .any { it.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT }
+                .any {
+                    it.kind == OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT ||
+                        it.kind == OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT
+                }
         }
 }

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/OutboundFileStaging.kt

@@ -37,5 +37,10 @@ suspend fun prepareOutboundFileForSend(
         exportUri = cacheUri,
     )
 
-    StagedOutboundPreview(stagedUri = staged.uri, aspectRatio = null, sizeBytes = staged.sizeBytes)
+    StagedOutboundPreview(
+        stagedUri = staged.uri,
+        previewUri = cacheUri,
+        aspectRatio = null,
+        sizeBytes = staged.sizeBytes,
+    )
 }

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/OutboundImageStaging.kt

@@ -10,6 +10,8 @@ import ru.fromchat.api.local.download.LocalDecodedImageCache
 
 data class StagedOutboundPreview(
     val stagedUri: String,
+    /** Decrypted-image cache URI for UI preview (preferred over [stagedUri]). */
+    val previewUri: String? = null,
     val aspectRatio: Float?,
     val sizeBytes: Long = 0L,
 )
@@ -30,7 +32,7 @@ suspend fun prepareOutboundImageForSend(
     }.getOrNull() ?: return@withContext null
     if (staged.sizeBytes <= 0L) return@withContext null
 
-    DecryptedImageCache.seedFromLocalFile(
+    val previewUri = DecryptedImageCache.seedFromLocalFile(
         messageId = optimisticMessageId,
         fileIndex = 0,
         localFileUri = staged.uri,
@@ -39,9 +41,18 @@ suspend fun prepareOutboundImageForSend(
 
     val storageKey = DecryptedImageCache.storageKey(optimisticMessageId, 0, clientMessageId)
     val decodeTarget = previewSeedDecodeSize(aspectRatio)
-    LocalDecodedImageCache.loadFull(storageKey, staged.uri, decodeTarget)
+    LocalDecodedImageCache.loadFull(
+        storageKey,
+        (previewUri ?: staged.uri).removePrefix("file://"),
+        decodeTarget,
+    )
 
-    StagedOutboundPreview(stagedUri = staged.uri, aspectRatio = aspectRatio, sizeBytes = staged.sizeBytes)
+    StagedOutboundPreview(
+        stagedUri = staged.uri,
+        previewUri = previewUri,
+        aspectRatio = aspectRatio,
+        sizeBytes = staged.sizeBytes,
+    )
 }
 
 /** High-quality seed decode before the tile is measured (refined when laid out). */

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/OutboxPayloads.kt

@@ -33,3 +33,15 @@ data class DmAttachmentOutboxPayload(
     val encryptedFileSizeBytes: Long = 0L,
     val uploadId: String = "",
 )
+
+@Serializable
+data class PublicAttachmentOutboxPayload(
+    val content: String,
+    val clientMessageId: String,
+    val replyToId: Int? = null,
+    val fileUri: String,
+    val filename: String,
+    val fileSizeBytes: Long = 0L,
+    val aspectRatio: Float? = null,
+    val uploadId: String = "",
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/OutgoingMessageCoordinator.kt

@@ -255,6 +255,53 @@ object OutgoingMessageCoordinator {
         kickOutboxDrain(instanceId)
     }
 
+    suspend fun enqueuePublicAttachment(
+        content: String,
+        clientMessageId: String,
+        replyToId: Int?,
+        fileUri: String,
+        filename: String,
+        optimisticMessage: Message,
+        aspectRatio: Float? = null,
+        fileSizeBytes: Long = 0L,
+    ) {
+        val instanceId = CacheContext.requireActiveInstanceId()
+        val conversationId = conversationIdForGroup(GENERAL_PUBLIC_GROUP_ID)
+        AttachmentUploadNotifier.emit(
+            AttachmentUploadProgress.Pending(clientMessageId, filename),
+            messageLabel = content,
+        )
+        AttachmentUploadNotifier.emit(
+            AttachmentUploadProgress.InProgress(clientMessageId, 1, filename),
+            messageLabel = content,
+        )
+        withContext(Dispatchers.Default) {
+            MessageRepository.upsertPublicMessage(optimisticMessage)
+            val payload = json.encodeToString(
+                PublicAttachmentOutboxPayload(
+                    content = content,
+                    clientMessageId = clientMessageId,
+                    replyToId = replyToId,
+                    fileUri = fileUri,
+                    filename = filename,
+                    fileSizeBytes = fileSizeBytes.coerceAtLeast(0L),
+                    aspectRatio = aspectRatio?.takeIf { it > 0f },
+                ),
+            )
+            MessageDatabaseProvider.database.messageDatabaseQueries.upsertOutbox(
+                instanceId = instanceId,
+                clientMessageId = clientMessageId,
+                conversationId = conversationId,
+                kind = KIND_SEND_PUBLIC_ATTACHMENT,
+                payloadJson = payload,
+                retryCount = 0L,
+                nextAttemptAt = null,
+                bytesUploaded = 0L,
+            )
+        }
+        kickOutboxDrain(instanceId)
+    }
+
     suspend fun clearAttachmentOutboxAfterAck(clientMessageId: String) {
         val cid = clientMessageId.trim()
         if (cid.isEmpty()) return
@@ -281,6 +328,22 @@ object OutgoingMessageCoordinator {
             }
     }
 
+    suspend fun abortPublicServerUploadIfNeeded(uploadId: String) {
+        val id = uploadId.trim()
+        if (id.isEmpty()) return
+        runCatching { ApiClient.abortPublicUpload(id) }
+            .onSuccess {
+                AttachmentMediaLog.upload("public_server_abort_ok", "uploadId" to id)
+            }
+            .onFailure { error ->
+                AttachmentMediaLog.upload(
+                    "public_server_abort_failed",
+                    "uploadId" to id,
+                    "error" to (error.message ?: "unknown"),
+                )
+            }
+    }
+
     /** Re-queues a failed public / text outbound row (outbox row must still exist). */
     fun retryOutboundMessage(clientMessageId: String, conversationId: String) {
         val cid = clientMessageId.trim()
@@ -316,11 +379,15 @@ object OutgoingMessageCoordinator {
             val row = MessageDatabaseProvider.database.messageDatabaseQueries
                 .selectOutboxItem(instanceId, cid)
                 .executeAsOneOrNull()
-            if (row?.kind == KIND_SEND_DM_ATTACHMENT) {
-                runCatching {
+            when (row?.kind) {
+                KIND_SEND_DM_ATTACHMENT -> runCatching {
                     val payload = json.decodeFromString<DmAttachmentOutboxPayload>(row.payloadJson)
                     abortDmServerUploadIfNeeded(payload.uploadId)
                 }
+                KIND_SEND_PUBLIC_ATTACHMENT -> runCatching {
+                    val payload = json.decodeFromString<PublicAttachmentOutboxPayload>(row.payloadJson)
+                    abortPublicServerUploadIfNeeded(payload.uploadId)
+                }
             }
             MessageDatabaseProvider.database.messageDatabaseQueries.deleteOutboxItem(instanceId, cid)
             MessageCacheStore.deleteMessageByClientMessageId(conversationId, cid)
@@ -366,7 +433,14 @@ object OutgoingMessageCoordinator {
                             scheduleOutboxRetry(id)
                         }
                     }
-                    KIND_SEND_DM_ATTACHMENT_AWAITING_ACK -> Unit
+                    KIND_SEND_PUBLIC_ATTACHMENT -> {
+                        if (!PublicAttachmentOutboxHandler.process(row)) {
+                            allOk = false
+                            scheduleOutboxRetry(id)
+                        }
+                    }
+                    KIND_SEND_DM_ATTACHMENT_AWAITING_ACK,
+                    KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK -> Unit
                 }
             }
             allOk
@@ -378,6 +452,9 @@ object OutgoingMessageCoordinator {
     const val KIND_SEND_DM_ATTACHMENT = "send_dm_attachment"
     /** Upload+send finished; row kept until DM ack so UI can still resolve local preview from outbox. */
     const val KIND_SEND_DM_ATTACHMENT_AWAITING_ACK = "send_dm_attachment_awaiting_ack"
+    const val KIND_SEND_PUBLIC_ATTACHMENT = "send_public_attachment"
+    /** Upload+send finished; row kept briefly so UI can still resolve local preview from outbox. */
+    const val KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK = "send_public_attachment_awaiting_ack"
 
     suspend fun pruneStaleAttachmentOutboxForInstance(instanceId: String) {
         val id = instanceId.trim()
@@ -392,7 +469,9 @@ object OutgoingMessageCoordinator {
             for (row in rows) {
                 when (row.kind) {
                     KIND_SEND_DM_ATTACHMENT,
-                    KIND_SEND_DM_ATTACHMENT_AWAITING_ACK -> {
+                    KIND_SEND_DM_ATTACHMENT_AWAITING_ACK,
+                    KIND_SEND_PUBLIC_ATTACHMENT,
+                    KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK -> {
                         if (!MessageCacheStore.hasSentMessageWithClientId(
                                 row.conversationId,
                                 row.clientMessageId,

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/send/PublicAttachmentOutboxHandler.kt

@@ -0,0 +1,460 @@
+package ru.fromchat.api.local.send
+
+import com.pr0gramm3r101.utils.crypto.Base64
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.json.Json
+import ru.fromchat.api.ApiClient
+import ru.fromchat.api.local.AttachmentMediaLog
+import ru.fromchat.api.local.cache.DecryptedImageCache
+import ru.fromchat.api.local.cache.OutboundFileUnavailableException
+import ru.fromchat.api.local.cache.UPLOAD_ERROR_FILE_TOO_LARGE
+import ru.fromchat.api.local.cache.isFileTooLargeForUpload
+import ru.fromchat.api.local.cache.isLikelyUploadMemoryError
+import ru.fromchat.api.local.cache.isOutboundFileUnavailable
+import ru.fromchat.api.local.cache.openOutboundFileInputStream
+import ru.fromchat.api.local.cache.queryOutboundUriSizeBytes
+import ru.fromchat.api.local.cache.repairInterruptedUploadArtifacts
+import ru.fromchat.api.local.cache.stageOutboundFileForUpload
+import ru.fromchat.api.local.db.store.MessageCacheStore
+import ru.fromchat.api.local.db.store.MessageDatabaseProvider
+import ru.fromchat.api.local.messages.optimisticMessageIdForClientMessageId
+import ru.fromchat.api.local.workers.AttachmentUploadNotifier
+import ru.fromchat.api.local.workers.AttachmentUploadProgress
+import ru.fromchat.api.local.db.isPlaceholderAttachmentAspectRatio
+import ru.fromchat.api.local.db.isPlaceholderAttachmentDimensions
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
+import ru.fromchat.api.schema.messages.publicchat.upload.PublicUploadCompleteResponse
+import ru.fromchat.db.Outbox
+import ru.fromchat.ui.chat.isImageFilename
+
+private const val DEFAULT_CHUNK_SIZE = 262_144
+
+object PublicAttachmentOutboxHandler {
+    private val json = Json { ignoreUnknownKeys = true; encodeDefaults = true }
+
+    private fun outboxRowExists(instanceId: String, clientMessageId: String): Boolean =
+        MessageDatabaseProvider.database.messageDatabaseQueries
+            .selectOutboxItem(instanceId, clientMessageId)
+            .executeAsOneOrNull() != null
+
+    private fun ensureStillQueued(instanceId: String, clientMessageId: String) {
+        if (!outboxRowExists(instanceId, clientMessageId)) {
+            AttachmentMediaLog.upload("cancelled_in_flight", "job" to clientMessageId)
+            throw kotlinx.coroutines.CancellationException("Upload cancelled")
+        }
+    }
+
+    suspend fun process(row: Outbox): Boolean {
+        if (row.kind != OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT) return false
+        val instanceId = row.instanceId
+        val payload = json.decodeFromString<PublicAttachmentOutboxPayload>(row.payloadJson)
+        val clientMessageId = payload.clientMessageId.trim()
+        if (clientMessageId.isEmpty()) return true
+        if (!outboxRowExists(instanceId, clientMessageId)) return true
+
+        val conversationId = row.conversationId
+        if (MessageCacheStore.hasSentMessageWithClientId(conversationId, clientMessageId)) {
+            withContext(Dispatchers.Default) {
+                MessageDatabaseProvider.database.messageDatabaseQueries.deleteOutboxItem(
+                    instanceId,
+                    clientMessageId,
+                )
+                MessageDatabaseProvider.database.messageDatabaseQueries.deletePendingMessageByClientMessageId(
+                    instanceId,
+                    conversationId,
+                    clientMessageId,
+                )
+            }
+            return true
+        }
+
+        val serverUploadId = arrayOf(payload.uploadId.trim())
+        return runCatching {
+            repairInterruptedUploadArtifacts(instanceId, clientMessageId)
+            ensureStillQueued(instanceId, clientMessageId)
+            AttachmentMediaLog.send(
+                "outbox_start",
+                "job" to clientMessageId.take(12),
+                "file" to payload.filename,
+                "bytes" to payload.fileSizeBytes,
+                "uploadId" to payload.uploadId.take(12),
+            )
+            AttachmentUploadNotifier.emit(
+                AttachmentUploadProgress.Pending(clientMessageId, payload.filename),
+                messageLabel = payload.content,
+            )
+            val stagedPayload = ensureStagedPayload(instanceId, row, payload)
+            if (isFileTooLargeForUpload(stagedPayload.fileSizeBytes)) {
+                throw IllegalStateException(UPLOAD_ERROR_FILE_TOO_LARGE)
+            }
+            if (!isImageFilename(stagedPayload.filename)) {
+                seedOutboundFileAsDownloaded(
+                    messageId = optimisticMessageIdForClientMessageId(clientMessageId),
+                    fileIndex = 0,
+                    localFileUri = stagedPayload.fileUri,
+                    displayFilename = stagedPayload.filename,
+                    clientMessageId = clientMessageId,
+                )
+            }
+            ensureStillQueued(instanceId, clientMessageId)
+            val restoredPercent = uploadPercent(row.bytesUploaded, stagedPayload)
+            AttachmentMediaLog.send(
+                "outbox_upload_begin",
+                "job" to clientMessageId.take(12),
+                "restoredPct" to restoredPercent,
+                "bytes" to stagedPayload.fileSizeBytes,
+            )
+            if (restoredPercent > 0) {
+                emitProgress(clientMessageId, restoredPercent, stagedPayload.filename, stagedPayload.content)
+            } else {
+                emitProgress(clientMessageId, 0, stagedPayload.filename, stagedPayload.content)
+            }
+
+            val completed = sendResumable(
+                instanceId = instanceId,
+                row = row,
+                payload = stagedPayload,
+                serverUploadId = serverUploadId,
+            )
+            ensureStillQueued(instanceId, clientMessageId)
+            AttachmentMediaLog.send(
+                "outbox_upload_complete",
+                "job" to clientMessageId.take(12),
+                "fileId" to completed.fileId,
+            )
+
+            val confirmed = ApiClient.sendMessageViaHttp(
+                content = stagedPayload.content,
+                replyToId = stagedPayload.replyToId,
+                clientMessageId = clientMessageId,
+                uploadedFileIds = listOf(completed.fileId),
+            )
+            val resolvedConfirmed = mergeConfirmedPublicAttachment(
+                confirmed = confirmed.copy(client_message_id = clientMessageId),
+                payload = stagedPayload,
+            )
+            AttachmentMediaLog.send(
+                "outbox_http_ack",
+                "job" to clientMessageId.take(12),
+                "realId" to resolvedConfirmed.id,
+                "files" to (resolvedConfirmed.files?.size ?: 0),
+                "aspect" to resolvedConfirmed.pendingFileAspectRatio,
+                "dims" to resolvedConfirmed.fileDimensions?.firstOrNull(),
+            )
+            withContext(Dispatchers.Default) {
+                if (resolvedConfirmed.id > 0 && isImageFilename(stagedPayload.filename)) {
+                    DecryptedImageCache.seedFromLocalFile(
+                        messageId = resolvedConfirmed.id,
+                        fileIndex = 0,
+                        localFileUri = stagedPayload.fileUri,
+                        clientMessageId = clientMessageId,
+                    )
+                    DecryptedImageCache.ensureDiskAliasForMessageId(
+                        messageId = resolvedConfirmed.id,
+                        fileIndex = 0,
+                        clientMessageId = clientMessageId,
+                    )
+                }
+                MessageCacheStore.confirmPublicMessage(
+                    clientMessageId,
+                    resolvedConfirmed,
+                )
+                MessageDatabaseProvider.database.messageDatabaseQueries.upsertOutbox(
+                    instanceId = instanceId,
+                    clientMessageId = clientMessageId,
+                    conversationId = row.conversationId,
+                    kind = OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT_AWAITING_ACK,
+                    payloadJson = row.payloadJson,
+                    retryCount = row.retryCount,
+                    nextAttemptAt = null,
+                    bytesUploaded = row.bytesUploaded,
+                )
+            }
+            AttachmentUploadNotifier.emit(
+                AttachmentUploadProgress.Success(clientMessageId),
+                messageLabel = payload.content,
+            )
+            AttachmentMediaLog.send(
+                "outbox_success",
+                "job" to clientMessageId.take(12),
+                "realId" to confirmed.id,
+            )
+            true
+        }.getOrElse { error ->
+            if (error is kotlinx.coroutines.CancellationException) {
+                OutgoingMessageCoordinator.abortPublicServerUploadIfNeeded(serverUploadId[0])
+                AttachmentMediaLog.send("outbox_cancelled", "job" to clientMessageId.take(12))
+                return true
+            }
+            AttachmentMediaLog.send(
+                "outbox_error",
+                "job" to clientMessageId.take(12),
+                "err" to (error.message ?: error::class.simpleName),
+            )
+            if (error.isOutboundFileUnavailable()) {
+                AttachmentUploadNotifier.emit(
+                    AttachmentUploadProgress.Failed(
+                        jobId = clientMessageId,
+                        error = error.message ?: "Attachment unavailable",
+                    ),
+                    messageLabel = payload.content,
+                )
+                runCatching {
+                    val optimisticId = optimisticMessageIdForClientMessageId(clientMessageId)
+                    clearOutboundImageCaches(clientMessageId, optimisticId)
+                    clearOutboundFileCaches(clientMessageId, optimisticId)
+                    OutgoingMessageCoordinator.cancelOutboundMessage(clientMessageId, row.conversationId)
+                }
+                return true
+            }
+            val failureKey = when {
+                error.message == UPLOAD_ERROR_FILE_TOO_LARGE -> UPLOAD_ERROR_FILE_TOO_LARGE
+                isLikelyUploadMemoryError(error) -> UPLOAD_ERROR_FILE_TOO_LARGE
+                else -> null
+            }
+            if (failureKey != null) {
+                AttachmentUploadNotifier.emit(
+                    AttachmentUploadProgress.Failed(
+                        jobId = clientMessageId,
+                        error = failureKey,
+                    ),
+                    messageLabel = payload.content,
+                )
+            } else {
+                // Transient (network / parse / 5xx): keep uploading UI and retry — do not flash failed.
+                AttachmentMediaLog.send(
+                    "outbox_retryable",
+                    "job" to clientMessageId.take(12),
+                    "err" to (error.message ?: error::class.simpleName),
+                )
+            }
+            false
+        }
+    }
+
+    private suspend fun sendResumable(
+        instanceId: String,
+        row: Outbox,
+        payload: PublicAttachmentOutboxPayload,
+        serverUploadId: Array<String>,
+    ): PublicUploadCompleteResponse {
+        val totalSize = payload.fileSizeBytes
+        if (totalSize <= 0L) {
+            throw OutboundFileUnavailableException("Attachment file is empty or unavailable")
+        }
+        var activePayload = payload
+        var bytesUploaded = row.bytesUploaded.coerceAtLeast(0L)
+        if (bytesUploaded > totalSize) {
+            bytesUploaded = 0L
+        }
+        var uploadId = activePayload.uploadId.trim().ifBlank { serverUploadId[0] }
+        try {
+            if (uploadId.isEmpty()) {
+                val init = ApiClient.initPublicUpload(
+                    filename = payload.filename,
+                    totalSize = totalSize,
+                    chunkSize = DEFAULT_CHUNK_SIZE,
+                )
+                uploadId = init.uploadId
+                serverUploadId[0] = uploadId
+                persistPayloadProgress(instanceId, row, activePayload.copy(uploadId = uploadId), bytesUploaded)
+            } else {
+                serverUploadId[0] = uploadId
+            }
+
+            val serverStatus = ApiClient.getPublicUploadStatus(uploadId)
+            val serverOffset = serverStatus.offset.coerceAtLeast(0L)
+            if (serverStatus.totalSize > 0L && serverStatus.totalSize != totalSize) {
+                OutgoingMessageCoordinator.abortPublicServerUploadIfNeeded(uploadId)
+                uploadId = ""
+                serverUploadId[0] = ""
+                bytesUploaded = 0L
+                val init = ApiClient.initPublicUpload(
+                    filename = activePayload.filename,
+                    totalSize = totalSize,
+                    chunkSize = DEFAULT_CHUNK_SIZE,
+                )
+                uploadId = init.uploadId
+                serverUploadId[0] = uploadId
+                activePayload = activePayload.copy(uploadId = uploadId)
+                persistPayloadProgress(instanceId, row, activePayload, bytesUploaded)
+            }
+            var offset = maxOf(bytesUploaded, serverOffset)
+            val input = openOutboundFileInputStream(activePayload.fileUri)
+                ?: throw OutboundFileUnavailableException("Failed to open staged attachment")
+            try {
+                skipBytes(input, offset)
+                while (offset < totalSize) {
+                    ensureStillQueued(instanceId, activePayload.clientMessageId)
+                    val chunkLen = minOf(DEFAULT_CHUNK_SIZE.toLong(), totalSize - offset).toInt()
+                    val chunk = ByteArray(chunkLen)
+                    var filled = 0
+                    while (filled < chunkLen) {
+                        val read = input.read(chunk, filled, chunkLen - filled)
+                        if (read < 0) break
+                        filled += read
+                    }
+                    if (filled <= 0) {
+                        throw OutboundFileUnavailableException("Unexpected EOF while reading attachment")
+                    }
+                    val toSend = if (filled == chunkLen) chunk else chunk.copyOf(filled)
+                    val chunkResp = ApiClient.uploadPublicChunk(
+                        uploadId = uploadId,
+                        offset = offset,
+                        dataB64 = Base64.encode(toSend),
+                    )
+                    offset = chunkResp.offsetReceived.coerceAtLeast(offset + toSend.size.toLong())
+                    val percent = ((offset.toDouble() / totalSize.toDouble()) * 100.0).toInt()
+                    emitProgress(activePayload.clientMessageId, percent, activePayload.filename, activePayload.content)
+                    persistPayloadProgress(
+                        instanceId,
+                        row,
+                        activePayload.copy(uploadId = uploadId),
+                        offset,
+                    )
+                }
+            } finally {
+                input.close()
+            }
+
+            val completed = ApiClient.completePublicUpload(uploadId)
+            serverUploadId[0] = ""
+            return completed
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            OutgoingMessageCoordinator.abortPublicServerUploadIfNeeded(uploadId)
+            serverUploadId[0] = ""
+            throw e
+        }
+    }
+
+    private suspend fun skipBytes(input: ru.fromchat.api.local.cache.OutboundFileInputStream, count: Long) {
+        if (count <= 0L) return
+        val buffer = ByteArray(DEFAULT_CHUNK_SIZE)
+        var remaining = count
+        while (remaining > 0L) {
+            val toRead = minOf(buffer.size.toLong(), remaining).toInt()
+            val read = input.read(buffer, 0, toRead)
+            if (read < 0) {
+                throw OutboundFileUnavailableException("Unexpected EOF while seeking attachment")
+            }
+            remaining -= read.toLong()
+        }
+    }
+
+    private suspend fun ensureStagedPayload(
+        instanceId: String,
+        row: Outbox,
+        payload: PublicAttachmentOutboxPayload,
+    ): PublicAttachmentOutboxPayload {
+        val expectedSize = payload.fileSizeBytes.takeIf { it > 0L }
+            ?: queryOutboundUriSizeBytes(payload.fileUri)
+            ?: 0L
+        val staged = stageOutboundFileForUpload(
+            instanceId = instanceId,
+            clientMessageId = payload.clientMessageId,
+            sourceUri = payload.fileUri,
+            expectedSizeBytes = expectedSize,
+        )
+        if (staged.sizeBytes <= 0L) {
+            throw OutboundFileUnavailableException("Attachment file is empty or unavailable")
+        }
+        val updated = payload.copy(fileUri = staged.uri, fileSizeBytes = staged.sizeBytes)
+        if (updated.fileUri == payload.fileUri && updated.fileSizeBytes == payload.fileSizeBytes) {
+            return updated
+        }
+        persistPayloadProgress(instanceId, row, updated, row.bytesUploaded)
+        return updated
+    }
+
+    private suspend fun persistPayloadProgress(
+        instanceId: String,
+        row: Outbox,
+        payload: PublicAttachmentOutboxPayload,
+        bytesUploaded: Long,
+    ) {
+        if (!outboxRowExists(instanceId, row.clientMessageId)) return
+        withContext(Dispatchers.Default) {
+            if (!outboxRowExists(instanceId, row.clientMessageId)) return@withContext
+            MessageDatabaseProvider.database.messageDatabaseQueries.upsertOutbox(
+                instanceId = instanceId,
+                clientMessageId = row.clientMessageId,
+                conversationId = row.conversationId,
+                kind = row.kind,
+                payloadJson = json.encodeToString(payload),
+                retryCount = row.retryCount,
+                nextAttemptAt = row.nextAttemptAt,
+                bytesUploaded = bytesUploaded,
+            )
+        }
+    }
+
+    private fun uploadPercent(bytesUploaded: Long, payload: PublicAttachmentOutboxPayload): Int {
+        val total = payload.fileSizeBytes
+        if (total <= 0L || bytesUploaded <= 0L) return 0
+        return ((bytesUploaded.toDouble() / total.toDouble()) * 100.0).toInt().coerceIn(0, 99)
+    }
+
+    private fun emitProgress(
+        jobId: String,
+        percent: Int,
+        filename: String? = null,
+        messageLabel: String? = null,
+    ) {
+        AttachmentUploadNotifier.emit(
+            AttachmentUploadProgress.InProgress(
+                jobId = jobId,
+                percent = percent.coerceIn(0, 100),
+                filename = filename,
+            ),
+            messageLabel = messageLabel,
+        )
+    }
+
+    private fun mergeConfirmedPublicAttachment(
+        confirmed: ru.fromchat.api.schema.messages.Message,
+        payload: PublicAttachmentOutboxPayload,
+    ): ru.fromchat.api.schema.messages.Message {
+        val laidOut = confirmed.resolvePublicAttachmentLayout()
+        AttachmentMediaLog.aspect(
+            "outbox_http_raw",
+            "job" to payload.clientMessageId.take(12),
+            "realId" to laidOut.id,
+            "pairs" to confirmed.fileAspectRatioPairs?.firstOrNull(),
+            "resolvedPairs" to laidOut.fileAspectRatioPairs?.firstOrNull(),
+            "resolvedDims" to laidOut.fileDimensions?.firstOrNull(),
+            "resolvedRatio" to laidOut.fileAspectRatios?.firstOrNull(),
+            "payloadAspect" to payload.aspectRatio,
+        )
+        val serverPair = laidOut.fileAspectRatioPairs?.firstOrNull()
+            ?: confirmed.fileAspectRatioPairs?.firstOrNull()
+        val serverDim = laidOut.fileDimensions?.firstOrNull()
+        val payloadAspect = payload.aspectRatio?.takeIf { it > 0f }
+        val serverHasReal = serverPair?.let { pair ->
+            pair.size >= 2 && !isPlaceholderAttachmentDimensions(pair[0], pair[1])
+        } == true || serverDim?.let { (w, h) ->
+            !isPlaceholderAttachmentDimensions(w, h)
+        } == true
+        if (!serverHasReal) {
+            val aspect = payloadAspect
+            val stagedUri = payload.fileUri.trim().takeIf { it.isNotEmpty() }
+            AttachmentMediaLog.aspect(
+                "outbox_apply_payload_aspect",
+                "job" to payload.clientMessageId.take(12),
+                "aspect" to aspect,
+                "stagedUri" to stagedUri?.take(48),
+            )
+            return laidOut.copy(
+                pendingFileUri = stagedUri?.takeIf { path ->
+                    com.pr0gramm3r101.utils.files.PlatformFileSystem.exists(
+                        path.removePrefix("file://"),
+                    )
+                },
+                pendingFileAspectRatio = aspect,
+                fileAspectRatios = aspect?.let { listOf(it) },
+            )
+        }
+        AttachmentMediaLog.aspect("outbox_keep_server", "job" to payload.clientMessageId.take(12))
+        return laidOut
+    }
+}

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/workers/AttachmentTransferBootstrap.kt

@@ -10,6 +10,7 @@ import ru.fromchat.api.local.db.store.MessageDatabaseProvider
 import ru.fromchat.api.local.download.AttachmentDownloadNotifier
 import ru.fromchat.api.local.send.DmAttachmentOutboxPayload
 import ru.fromchat.api.local.send.OutgoingMessageCoordinator
+import ru.fromchat.api.local.send.PublicAttachmentOutboxPayload
 import ru.fromchat.api.local.send.scheduleOutboxProcessing
 import ru.fromchat.api.local.cache.CacheContext
 import ru.fromchat.api.local.cache.repairInterruptedUploadArtifacts
@@ -53,9 +54,19 @@ object AttachmentTransferBootstrap {
             .selectPendingOutboxForInstance(instanceId)
             .executeAsList()
         for (row in rows) {
-            if (row.kind != OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT) continue
+            if (
+                row.kind != OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT &&
+                row.kind != OutgoingMessageCoordinator.KIND_SEND_PUBLIC_ATTACHMENT
+            ) {
+                continue
+            }
             val clientMessageId = runCatching {
-                json.decodeFromString<DmAttachmentOutboxPayload>(row.payloadJson).clientMessageId.trim()
+                when (row.kind) {
+                    OutgoingMessageCoordinator.KIND_SEND_DM_ATTACHMENT ->
+                        json.decodeFromString<DmAttachmentOutboxPayload>(row.payloadJson).clientMessageId.trim()
+                    else ->
+                        json.decodeFromString<PublicAttachmentOutboxPayload>(row.payloadJson).clientMessageId.trim()
+                }
             }.getOrNull().orEmpty()
             if (clientMessageId.isEmpty()) continue
             repairInterruptedUploadArtifacts(instanceId, clientMessageId)

app/shared/src/commonMain/kotlin/ru/fromchat/api/local/workers/AttachmentUploadNotifier.kt

@@ -25,7 +25,7 @@ object AttachmentUploadNotifier {
                     "msg" to msg,
                 )
             is AttachmentUploadProgress.InProgress -> {
-                if (progress.percent == 1 || progress.percent % 10 == 0 || progress.percent >= 95) {
+                if (progress.percent == 1 || progress.percent % 5 == 0 || progress.percent >= 95) {
                     AttachmentMediaLog.upload(
                         "progress",
                         "job" to progress.jobId,
@@ -33,20 +33,36 @@ object AttachmentUploadNotifier {
                         "file" to progress.filename,
                         "msg" to msg,
                     )
+                    AttachmentMediaLog.send(
+                        "upload_progress",
+                        "job" to progress.jobId.take(12),
+                        "pct" to progress.percent,
+                    )
                 }
             }
-            is AttachmentUploadProgress.Success ->
+            is AttachmentUploadProgress.Success -> {
                 AttachmentMediaLog.upload("success", "job" to progress.jobId, "msg" to msg)
-            is AttachmentUploadProgress.Failed ->
+                AttachmentMediaLog.send("upload_success", "job" to progress.jobId.take(12))
+            }
+            is AttachmentUploadProgress.Failed -> {
                 AttachmentMediaLog.upload(
                     "failed",
                     "job" to progress.jobId,
                     "err" to progress.error,
                     "msg" to msg,
                 )
+                AttachmentMediaLog.send(
+                    "upload_failed",
+                    "job" to progress.jobId.take(12),
+                    "err" to progress.error,
+                )
+            }
         }
-        mainScope.launch {
-            _progressFlow.emit(progress)
+        // Prefer immediate delivery so the determinate indicator tracks chunks.
+        if (!_progressFlow.tryEmit(progress)) {
+            mainScope.launch {
+                _progressFlow.emit(progress)
+            }
         }
     }
 }

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/Message.kt

@@ -38,16 +38,21 @@ data class Message(
     @Transient val uploadError: String? = null,
     /** For DM file decryption; not serialized over network. */
     @Transient val dmEnvelope: DmEnvelope? = null,
-    /** Blurhashes for image files (by index); from decrypted message JSON. */
-    @Transient val fileThumbnails: List<String>? = null,
-    /** Aspect ratios (width/height) for image files (by index); from decrypted message JSON. */
+    /** Base64 JPEG thumbnails for image files (by index); public API or decrypted DM JSON. */
+    @SerialName("fileThumbnails") val fileThumbnails: List<String>? = null,
+    /**
+     * Pixel [width, height] pairs from public API / DM plaintext.
+     * Prefer [fileDimensions] / [fileAspectRatios] for layout after [resolvePublicAttachmentLayout].
+     */
+    @SerialName("fileAspectRatios") val fileAspectRatioPairs: List<List<Int>>? = null,
+    /** File sizes in bytes (by index). */
+    @SerialName("fileSizes") val fileSizes: List<Long>? = null,
+    /** Aspect ratios (width/height) for image files (by index); derived client-side. */
     @Transient val fileAspectRatios: List<Float>? = null,
-    /** File sizes in bytes (by index); from decrypted message JSON. */
-    @Transient val fileSizes: List<Long>? = null,
-    /** Image dimensions (width, height) for image files (by index); from decrypted message JSON. */
+    /** Image dimensions (width, height) for image files (by index). */
     @Transient val fileDimensions: List<Pair<Int, Int>>? = null,
     /** True when DM plaintext could not be decrypted and [content] shows the corrupted placeholder. */
     @Transient val isContentCorrupted: Boolean = false,
     /** Reply target id from local DB when nested [reply_to] is not hydrated yet. */
     @Transient val replyToId: Int? = null,
-)
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/PublicAttachmentLayout.kt

@@ -0,0 +1,40 @@
+package ru.fromchat.api.schema.messages.publicchat
+
+import ru.fromchat.api.local.db.aspectRatioFromDimensionPair
+import ru.fromchat.api.local.db.isPlaceholderAttachmentDimensions
+import ru.fromchat.api.schema.messages.Message
+
+/**
+ * Maps public-API `[width, height]` pairs into layout fields used by attachment tiles.
+ */
+fun Message.resolvePublicAttachmentLayout(): Message {
+    val dims = fileAspectRatioPairs
+        ?.mapNotNull { pair ->
+            if (pair.size >= 2) {
+                val w = pair[0]
+                val h = pair[1]
+                if (w > 0 && h > 0 && !isPlaceholderAttachmentDimensions(w, h)) w to h else null
+            } else {
+                null
+            }
+        }
+        ?.takeIf { it.isNotEmpty() }
+        ?: fileDimensions?.filterNot { (w, h) -> isPlaceholderAttachmentDimensions(w, h) }
+            ?.takeIf { it.isNotEmpty() }
+    val ratios = dims
+        ?.map { (w, h) -> aspectRatioFromDimensionPair(w, h) }
+        ?.takeIf { it.isNotEmpty() }
+        ?: fileAspectRatios
+    if (dims == fileDimensions && ratios == fileAspectRatios) return this
+    val resolved = copy(fileDimensions = dims, fileAspectRatios = ratios)
+    if (fileAspectRatioPairs != null) {
+        ru.fromchat.api.local.AttachmentMediaLog.aspect(
+            "resolve_public_layout",
+            "msgId" to id,
+            "pairsIn" to fileAspectRatioPairs.firstOrNull(),
+            "dimsOut" to resolved.fileDimensions?.firstOrNull(),
+            "ratioOut" to resolved.fileAspectRatios?.firstOrNull(),
+        )
+    }
+    return resolved
+}

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/SendMessageRequest.kt

@@ -7,4 +7,5 @@ data class SendMessageRequest(
     val content: String,
     val reply_to_id: Int? = null,
     val client_message_id: String? = null,
-)
+    val uploaded_file_ids: List<String>? = null,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadChunkRequest.kt

@@ -0,0 +1,10 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PublicUploadChunkRequest(
+    val offset: Long,
+    @SerialName("data_b64") val dataB64: String,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadChunkResponse.kt

@@ -0,0 +1,10 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/** Matches file_storage resumable chunk response: `{"offset_received": <long>}`. */
+@Serializable
+data class PublicUploadChunkResponse(
+    @SerialName("offset_received") val offsetReceived: Long = 0L,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadCompleteResponse.kt

@@ -0,0 +1,10 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PublicUploadCompleteResponse(
+    @SerialName("file_id") val fileId: String,
+    @SerialName("upload_id") val uploadId: String,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadInitRequest.kt

@@ -0,0 +1,11 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PublicUploadInitRequest(
+    val filename: String,
+    @SerialName("total_size") val totalSize: Long,
+    @SerialName("chunk_size") val chunkSize: Int? = null,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadInitResponse.kt

@@ -0,0 +1,11 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PublicUploadInitResponse(
+    @SerialName("upload_id") val uploadId: String,
+    @SerialName("chunk_size") val chunkSize: Int,
+    val offset: Long = 0L,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/api/schema/messages/publicchat/upload/PublicUploadStatusResponse.kt

@@ -0,0 +1,12 @@
+package ru.fromchat.api.schema.messages.publicchat.upload
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PublicUploadStatusResponse(
+    @SerialName("upload_id") val uploadId: String,
+    val offset: Long = 0L,
+    @SerialName("total_size") val totalSize: Long = 0L,
+    val complete: Boolean = false,
+)

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/AttachmentPreview.kt

@@ -22,18 +22,16 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.sizeIn
 import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.rounded.AttachFile
 import androidx.compose.material.icons.rounded.Download
-import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.CircularWavyProgressIndicator
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
 import androidx.compose.material3.Icon
@@ -69,13 +67,11 @@ import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.IntSize
 import androidx.compose.ui.unit.dp
 import coil3.compose.AsyncImage
-import com.pr0gramm3r101.utils.conditional
 import com.pr0gramm3r101.utils.crypto.Base64
 import dev.chrisbanes.haze.hazeEffect
 import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
 import dev.chrisbanes.haze.materials.HazeMaterials
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import org.jetbrains.compose.resources.stringResource
@@ -102,17 +98,25 @@ import ru.fromchat.ui.chat.components.AttachmentLeadingTransitionMs
 import ru.fromchat.ui.chat.components.CancellableAttachmentProgressIndicator
 import ru.fromchat.ui.chat.components.ChatFileAttachmentTile
 import ru.fromchat.ui.chat.components.FileAttachmentLeadingSlot
+import ru.fromchat.ui.chat.utils.ATTACHMENT_TILE_MAX_WIDTH
+import ru.fromchat.ui.chat.utils.attachmentDecodeCacheKeys
 import ru.fromchat.ui.chat.utils.attachmentImageCornerShape
+import ru.fromchat.ui.chat.utils.attachmentTileLayout
 import ru.fromchat.ui.chat.utils.coalesceDecodeTarget
 import ru.fromchat.ui.chat.utils.decodeSizeChangedMeaningfully
+import ru.fromchat.ui.chat.utils.peekDecodedAttachmentBitmap
 import ru.fromchat.ui.components.Text
 import com.pr0gramm3r101.utils.scaleOnPress
 import ru.fromchat.ui.chat.MessageGroupInfo
 
-private val IMAGE_SIZE = 160.dp
-private val IMAGE_MAX_HEIGHT = 240.dp
 private const val BLUR_FADE_MS = 450
 
+private enum class AttachmentTileVisual {
+    Empty,
+    Thumb,
+    Full,
+}
+
 internal fun isImageFilename(name: String): Boolean =
     name.endsWith(".png", true) || name.endsWith(".jpg", true) ||
         name.endsWith(".jpeg", true) || name.endsWith(".gif", true) || name.endsWith(".webp", true)
@@ -163,7 +167,7 @@ fun AttachmentPreview(
     }
 
     val isPendingImage = pendingFileUri != null && isImage && file == null && dmEnvelope == null
-    val isConfirmedImage = file != null && isImage && dmEnvelope != null && !isPendingImage
+    val isConfirmedImage = file != null && isImage && !isPendingImage
     val showImageTile = isPendingImage || isConfirmedImage
     val isPendingFile = pendingFileUri != null && !isImage
 
@@ -213,18 +217,9 @@ fun AttachmentPreview(
                             Modifier
                         }
                     )
-                    .conditional(
-                        fileAspectRatio != null && fileAspectRatio > 0f,
-                        `if` = {
-                            Modifier
-                                .heightIn(max = IMAGE_MAX_HEIGHT)
-                                .widthIn(max = IMAGE_SIZE)
-                                .aspectRatio(fileAspectRatio!!, matchHeightConstraintsFirst = true)
-                        },
-                        `else` = {
-                            Modifier.sizeIn(maxWidth = IMAGE_SIZE, maxHeight = IMAGE_MAX_HEIGHT)
-                        }
-                    )
+                    // Explicit px size from dp max + aspect — do not wrap to thumb intrinsics
+                    // (IntrinsicSize.Max bubbles otherwise shrink to ~80px ≈ 3× too small).
+                    .attachmentTileLayout(aspectRatio = fileAspectRatio)
                     .clip(attachmentImageCornerShape(isAuthor, messageGroup))
                     .then(
                         if (onImageBounds != null && showImageTile) {
@@ -251,8 +246,11 @@ fun AttachmentPreview(
                         .fillMaxSize()
                         .graphicsLayer { alpha = if (isExpanded) 0f else 1f }
                 ) {
-                    val imageStableKey = clientMessageId?.trim()?.takeIf { it.isNotEmpty() }
-                        ?: "img:${messageId ?: 0}:${fileIndex ?: 0}"
+                    val imageStableKey = when {
+                        (messageId ?: 0) > 0 -> "img:$messageId:${fileIndex ?: 0}"
+                        else -> clientMessageId?.trim()?.takeIf { it.isNotEmpty() }
+                            ?: "img:${messageId ?: 0}:${fileIndex ?: 0}"
+                    }
                     key(imageStableKey) {
                         ChatImageTileContent(
                             messageId = messageId ?: -1,
@@ -314,45 +312,74 @@ private fun ChatImageTileContent(
     val clipShape = attachmentImageCornerShape(isAuthor, messageGroup)
     val cacheClientId = clientMessageId?.trim()?.takeIf { it.isNotEmpty() }
     val layoutAspect = aspectRatio?.takeIf { it.isFinite() && it > 0f }
-    val fallbackDecodeSize = rememberChatPreviewDecodeSize(IMAGE_SIZE, layoutAspect)
+    val fallbackDecodeSize = rememberChatPreviewDecodeSize(ATTACHMENT_TILE_MAX_WIDTH, layoutAspect)
     val seedDecodeSize = remember(layoutAspect) { previewSeedDecodeSize(layoutAspect) }
-    val decryptCacheKey = remember(messageId, fileIndex, cacheClientId) {
-        DecryptedImageCache.storageKey(messageId, fileIndex, cacheClientId)
+    val decodeCacheKeys = remember(cacheClientId, messageId, fileIndex) {
+        attachmentDecodeCacheKeys(messageId, fileIndex, cacheClientId)
     }
-    var tileDecodeSize by remember(decryptCacheKey) { mutableStateOf<ChatPreviewDecodeSize?>(null) }
+    val bitmapStateKey = remember(decodeCacheKeys) { decodeCacheKeys.joinToString("|") }
+    val decryptCacheKey = decodeCacheKeys.first()
+    var tileDecodeSize by remember(bitmapStateKey) { mutableStateOf<ChatPreviewDecodeSize?>(null) }
     val decodeSize = remember(tileDecodeSize, fallbackDecodeSize, seedDecodeSize) {
         coalesceDecodeTarget(tileDecodeSize, fallbackDecodeSize, seedDecodeSize)
     }
 
-    val initialFull = remember(decryptCacheKey) { LocalDecodedImageCache.peekFull(decryptCacheKey) }
-    val hadInstantFull = initialFull != null
-    var cachedPath by remember(decryptCacheKey) {
+    var cachedPath by remember(bitmapStateKey) {
         mutableStateOf(DecryptedImageCache.getCached(messageId, fileIndex, cacheClientId))
     }
     val diskCacheUri = cachedPath
     val hasDiskCache = diskCacheUri != null
     val displayLocalUri = localUri?.trim()?.takeIf { it.isNotEmpty() } ?: diskCacheUri
     val hasLocalSource = displayLocalUri != null
-    val hasServerThumb = thumbnailBase64?.isNotBlank() == true
-    val useBlurredThumbPlaceholder = hasServerThumb && !hasDiskCache
 
-    var fullBitmap by remember(decryptCacheKey) {
+    val initialFull = remember(bitmapStateKey) { peekDecodedAttachmentBitmap(decodeCacheKeys) }
+    var fullBitmap by remember(bitmapStateKey) {
         mutableStateOf(initialFull)
     }
-    var didRevealFull by remember(decryptCacheKey) { mutableStateOf(hadInstantFull || hasDiskCache) }
-    val thumbBlurAlpha = remember(decryptCacheKey, useBlurredThumbPlaceholder, hasLocalSource) {
-        Animatable(
-            when {
-                hadInstantFull || hasDiskCache -> 0f
-                useBlurredThumbPlaceholder || hasLocalSource -> 1f
-                else -> 0f
-            },
+    val placeholderMemoryKey = remember(decryptCacheKey) { "${decryptCacheKey}#placeholder" }
+    val thumbnailBytes = remember(thumbnailBase64) {
+        thumbnailBase64?.let { decodeAttachmentThumbnailBase64(it) }
+    }
+    val initialPlaceholder = remember(bitmapStateKey) {
+        DecryptedImageCache.peekPlaceholderThumb(
+            memoryKey = placeholderMemoryKey,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = cacheClientId,
         )
     }
-    val fullRevealAlpha = remember(decryptCacheKey) {
-        Animatable(if (hadInstantFull) 1f else 0f)
+    val placeholderBitmap by produceState(
+        initialValue = initialPlaceholder,
+        placeholderMemoryKey,
+        decryptCacheKey,
+        thumbnailBytes,
+        messageId,
+        fileIndex,
+        cacheClientId,
+        diskCacheUri,
+        displayLocalUri,
+    ) {
+        value = DecryptedImageCache.decodePlaceholderThumb(
+            memoryKey = placeholderMemoryKey,
+            messageId = messageId,
+            fileIndex = fileIndex,
+            clientMessageId = cacheClientId,
+            serverThumbBytes = thumbnailBytes,
+        ) ?: initialPlaceholder
     }
-    val showOutboundBlurOverlay = isOutboundPending && hasLocalSource
+    val hasFullPreview = fullBitmap != null
+    val hasPlaceholder = placeholderBitmap != null
+    var decryptFinished by remember(bitmapStateKey) {
+        mutableStateOf(fullBitmap != null || placeholderBitmap != null)
+    }
+    val tileVisual = when {
+        fullBitmap != null -> AttachmentTileVisual.Full
+        placeholderBitmap != null -> AttachmentTileVisual.Thumb
+        else -> AttachmentTileVisual.Empty
+    }
+    val showOutboundBlurOverlay = (isOutboundPending || isUploading || awaitingServerAck) &&
+        (hasLocalSource || hasFullPreview || hasPlaceholder)
+    val treatAsOutbound = isOutboundPending || isUploading || awaitingServerAck
     val outboundOverlayAlpha = remember(showOutboundBlurOverlay) {
         Animatable(if (showOutboundBlurOverlay) 1f else 0f)
     }
@@ -372,50 +399,27 @@ private fun ChatImageTileContent(
         AttachmentDownloadNotifier.isCancelled(messageId, fileIndex, cacheClientId) ||
             AttachmentDownloadNotifier.hasResumablePartial(messageId, fileIndex, cacheClientId)
     }
-    LaunchedEffect(messageId, fileIndex, cacheClientId) {
+    LaunchedEffect(messageId, fileIndex, cacheClientId, isOutboundPending, isUploading, awaitingServerAck) {
+        if (isOutboundPending || isUploading || awaitingServerAck) {
+            AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
+            return@LaunchedEffect
+        }
         AttachmentDownloadNotifier.restorePausedForAttachment(
             messageId = messageId,
             fileIndex = fileIndex,
             clientMessageId = cacheClientId,
         )
     }
-    var isAwaitingNetworkFull by remember(decryptCacheKey) { mutableStateOf(false) }
-    var loadAttempt by remember(decryptCacheKey) { mutableIntStateOf(0) }
+    var isAwaitingNetworkFull by remember(bitmapStateKey) { mutableStateOf(false) }
+    var loadAttempt by remember(bitmapStateKey) { mutableIntStateOf(0) }
     LaunchedEffect(showOutboundBlurOverlay) {
         if (showOutboundBlurOverlay) {
             outboundOverlayAlpha.snapTo(1f)
         } else {
-            if (fullBitmap != null) {
-                didRevealFull = true
-                fullRevealAlpha.snapTo(1f)
-                thumbBlurAlpha.snapTo(0f)
-            }
             outboundOverlayAlpha.animateTo(0f, tween(BLUR_FADE_MS, easing = FastOutSlowInEasing))
         }
     }
 
-    val thumbnailBytes = remember(thumbnailBase64, hasDiskCache) {
-        if (hasDiskCache) null else thumbnailBase64?.let { decodeAttachmentThumbnailBase64(it) }
-    }
-    val thumbBitmap by produceState(
-        initialValue = if (hasDiskCache) null else LocalDecodedImageCache.peekThumb(decryptCacheKey),
-        decryptCacheKey,
-        thumbnailBytes,
-        decodeSize,
-        hasDiskCache,
-    ) {
-        if (hasDiskCache || thumbnailBytes == null) {
-            value = null
-            return@produceState
-        }
-        value = LocalDecodedImageCache.peekThumb(decryptCacheKey)
-            ?: withContext(Dispatchers.Default) {
-                LocalDecodedImageCache.loadThumb(decryptCacheKey, thumbnailBytes, decodeSize)
-            }
-    }
-    var decryptFinished by remember(decryptCacheKey) {
-        mutableStateOf(fullBitmap != null)
-    }
     val imageContentScale = ContentScale.Fit
     val tilePlaceholderColor = MaterialTheme.colorScheme.surfaceContainerHigh.copy(alpha = 0.42f)
 
@@ -445,6 +449,26 @@ private fun ChatImageTileContent(
             "diskCache" to (diskCacheUri?.take(48) ?: "null"),
             "target" to "${decodeSize.widthPx}x${decodeSize.heightPx}",
         )
+        // Already showing a decoded preview — never flash failed/loading by re-fetching.
+        val cachedBitmap = fullBitmap ?: peekDecodedAttachmentBitmap(decodeCacheKeys)
+        if (cachedBitmap != null && (isOutboundPending || isUploading || awaitingServerAck ||
+                isAuthor || hasLocalSource)
+        ) {
+            if (fullBitmap == null) {
+                fullBitmap = cachedBitmap
+            }
+            decryptFinished = true
+            AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
+            onFullyLoaded(true)
+            AttachmentMediaLog.send(
+                "tile_keep_local",
+                "key" to decryptCacheKey,
+                "msgId" to messageId,
+                "pending" to isOutboundPending,
+                "uploading" to isUploading,
+            )
+            return@LaunchedEffect
+        }
         val diskUri = diskCacheUri
             ?: DecryptedImageCache.getCached(messageId, fileIndex, cacheClientId)?.also { cachedPath = it }
         val localPaths = buildList {
@@ -452,13 +476,14 @@ private fun ChatImageTileContent(
             diskUri?.let { cached -> if (none { it == cached }) add(cached) }
         }
         if (localPaths.isNotEmpty()) {
+            val quickDecode = previewSeedDecodeSize(aspectRatio)
             val loaded = withContext(Dispatchers.Default) {
-                LocalDecodedImageCache.peekFull(decryptCacheKey)
+                peekDecodedAttachmentBitmap(decodeCacheKeys)
                     ?: localPaths.firstNotNullOfOrNull { path ->
                         LocalDecodedImageCache.loadFull(
                             decryptCacheKey,
                             path.removePrefix("file://"),
-                            decodeSize,
+                            quickDecode,
                         )
                     }
             }
@@ -472,26 +497,67 @@ private fun ChatImageTileContent(
                 fullBitmap = loaded
                 cachedPath = diskUri ?: localPaths.firstOrNull()
                 decryptFinished = true
-                didRevealFull = true
-                fullRevealAlpha.snapTo(1f)
-                thumbBlurAlpha.snapTo(0f)
+                AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
+                onFullyLoaded(true)
+                // Own sends with a local preview never need a network round-trip for display.
+                if (isOutboundPending || isAuthor) return@LaunchedEffect
+            } else {
+                AttachmentMediaLog.tileLoad(
+                    "load_local_miss",
+                    "key" to decryptCacheKey,
+                    "paths" to localPaths.size,
+                )
+            }
+        }
+        // Own sends: never fall through to network while a local/disk preview exists (or is expected).
+        if (isOutboundPending || isUploading || awaitingServerAck || isAuthor) {
+            if (fullBitmap == null && localPaths.isEmpty()) {
+                DecryptedImageCache.getCached(messageId, fileIndex, cacheClientId)?.let { uri ->
+                    cachedPath = uri
+                    val loaded = withContext(Dispatchers.Default) {
+                        LocalDecodedImageCache.loadFull(
+                            decryptCacheKey,
+                            uri.removePrefix("file://"),
+                            decodeSize,
+                        )
+                    }
+                    if (loaded != null) {
+                        fullBitmap = loaded
+                        decryptFinished = true
+                        AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
+                        onFullyLoaded(true)
+                        AttachmentMediaLog.send(
+                            "tile_cache_hit",
+                            "key" to decryptCacheKey,
+                            "msgId" to messageId,
+                        )
+                        return@LaunchedEffect
+                    }
+                }
+            }
+            if (fullBitmap != null || placeholderBitmap != null || localPaths.isNotEmpty() ||
+                cachedPath != null
+            ) {
+                decryptFinished = true
+                AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
                 onFullyLoaded(true)
                 return@LaunchedEffect
             }
-            AttachmentMediaLog.tileLoad(
-                "load_local_miss",
-                "key" to decryptCacheKey,
-                "paths" to localPaths.size,
-            )
+            if (isOutboundPending || isUploading || awaitingServerAck || localUri != null) {
+                decryptFinished = placeholderBitmap != null || thumbnailBytes != null
+                AttachmentMediaLog.send(
+                    "tile_outbound_wait",
+                    "key" to decryptCacheKey,
+                    "msgId" to messageId,
+                    "local" to (localUri?.take(32) ?: "null"),
+                    "failed" to decryptFailed,
+                )
+                return@LaunchedEffect
+            }
         }
-        if (isOutboundPending) {
-            decryptFinished = localPaths.isEmpty() && thumbBitmap == null && thumbnailBytes == null
-            if (fullBitmap != null || thumbBitmap != null) onFullyLoaded(true)
-            return@LaunchedEffect
-        }
-        if (serverFile == null || envelope == null) {
+        if (serverFile == null) {
             decryptFinished = true
-            AttachmentMediaLog.tileLoad("load_skip_no_envelope", "key" to decryptCacheKey)
+            AttachmentMediaLog.tileLoad("load_skip_no_file", "key" to decryptCacheKey)
             return@LaunchedEffect
         }
         if (diskUri != null) {
@@ -510,9 +576,6 @@ private fun ChatImageTileContent(
                 )
                 fullBitmap = loaded
                 decryptFinished = true
-                didRevealFull = true
-                fullRevealAlpha.snapTo(1f)
-                thumbBlurAlpha.snapTo(0f)
                 onFullyLoaded(true)
                 return@LaunchedEffect
             }
@@ -522,22 +585,33 @@ private fun ChatImageTileContent(
                 "uri" to diskUri,
             )
         }
+        val usePlainDownload = envelope == null
         AttachmentMediaLog.tileLoad(
-            "load_network_decrypt",
+            if (usePlainDownload) "load_network_plain" else "load_network_decrypt",
             "key" to decryptCacheKey,
             "file" to serverFile.path,
         )
         isAwaitingNetworkFull = true
         val uri = try {
-            DecryptedImageCache.getOrDecrypt(
-                messageId = messageId,
-                fileIndex = fileIndex,
-                file = serverFile,
-                envelope = envelope,
-                currentUserId = currentUserId,
-                clientMessageId = cacheClientId,
-                messageLabel = messageLabel,
-            )
+            if (usePlainDownload) {
+                DecryptedImageCache.getOrDownloadPlain(
+                    messageId = messageId,
+                    fileIndex = fileIndex,
+                    file = serverFile,
+                    clientMessageId = cacheClientId,
+                    messageLabel = messageLabel,
+                )
+            } else {
+                DecryptedImageCache.getOrDecrypt(
+                    messageId = messageId,
+                    fileIndex = fileIndex,
+                    file = serverFile,
+                    envelope = envelope,
+                    currentUserId = currentUserId,
+                    clientMessageId = cacheClientId,
+                    messageLabel = messageLabel,
+                )
+            }
         } catch (error: Throwable) {
             AttachmentMediaLog.tileLoad(
                 "load_exception",
@@ -566,9 +640,6 @@ private fun ChatImageTileContent(
         )
         if (fullBitmap != null) {
             AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
-            didRevealFull = true
-            fullRevealAlpha.snapTo(1f)
-            thumbBlurAlpha.snapTo(0f)
             onFullyLoaded(true)
         }
     }
@@ -596,53 +667,39 @@ private fun ChatImageTileContent(
         }
     }
 
-    LaunchedEffect(fullBitmap, thumbBitmap, hadInstantFull, hasDiskCache) {
-        when {
-            fullBitmap == null -> {
-                if (hasDiskCache) {
-                    thumbBlurAlpha.snapTo(0f)
-                    return@LaunchedEffect
-                }
-                didRevealFull = false
-                fullRevealAlpha.snapTo(0f)
-                if (thumbBitmap != null) thumbBlurAlpha.snapTo(1f)
-            }
-            didRevealFull -> return@LaunchedEffect
-            hadInstantFull || hasDiskCache -> {
-                didRevealFull = true
-                fullRevealAlpha.snapTo(1f)
-                thumbBlurAlpha.snapTo(0f)
-            }
-            thumbBitmap != null -> {
-                didRevealFull = true
-                thumbBlurAlpha.snapTo(1f)
-                fullRevealAlpha.snapTo(0f)
-                coroutineScope {
-                    launch {
-                        thumbBlurAlpha.animateTo(0f, tween(BLUR_FADE_MS, easing = FastOutSlowInEasing))
-                    }
-                    launch {
-                        fullRevealAlpha.animateTo(1f, tween(BLUR_FADE_MS, easing = FastOutSlowInEasing))
-                    }
-                }
-            }
-            else -> {
-                didRevealFull = true
-                fullRevealAlpha.snapTo(1f)
-                thumbBlurAlpha.snapTo(0f)
-            }
+    LaunchedEffect(placeholderBitmap) {
+        if (placeholderBitmap != null) decryptFinished = true
+    }
+
+    LaunchedEffect(treatAsOutbound, messageId, fileIndex, cacheClientId) {
+        if (treatAsOutbound) {
+            AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
         }
     }
 
-    val isDownloadingFullImage = !isOutboundPending && fullBitmap == null &&
-        (downloadProgress != null || isAwaitingNetworkFull)
-    val showDownloadProgressOverlay = isDownloadingFullImage && !showOutboundBlurOverlay && !downloadCancelled
-    val showDownloadCancelledOverlay = downloadCancelled && fullBitmap == null && !isOutboundPending
-    val showLoadFailedOverlay = decryptFailed && fullBitmap == null && !isOutboundPending && !downloadCancelled
-    val showSpinnerOnly = fullBitmap == null && thumbBitmap == null && !hasLocalSource &&
+    LaunchedEffect(hasLocalSource, hasDiskCache, fullBitmap, placeholderBitmap, isAuthor, messageId, fileIndex, cacheClientId) {
+        if (isAuthor && (hasLocalSource || hasDiskCache || fullBitmap != null || placeholderBitmap != null)) {
+            AttachmentDownloadNotifier.clearProgress(messageId, fileIndex, cacheClientId)
+        }
+    }
+
+    val suppressNetworkChrome = treatAsOutbound || hasLocalSource || hasDiskCache ||
+        fullBitmap != null || placeholderBitmap != null || (isAuthor && localUri != null)
+    val isDownloadingFullImage = !treatAsOutbound && fullBitmap == null &&
+        (downloadProgress != null || isAwaitingNetworkFull) && !suppressNetworkChrome
+    val showDownloadProgressOverlay = isDownloadingFullImage && !showOutboundBlurOverlay &&
+        !downloadCancelled && !hasLocalSource
+    val showDownloadCancelledOverlay = downloadCancelled && fullBitmap == null && !treatAsOutbound &&
+        !suppressNetworkChrome
+    val showLoadFailedOverlay = decryptFailed && fullBitmap == null && !treatAsOutbound &&
+        !downloadCancelled && !suppressNetworkChrome
+    val showSpinnerOnly = fullBitmap == null && placeholderBitmap == null && !hasLocalSource &&
+        !suppressNetworkChrome &&
         !showLoadFailedOverlay &&
         !showOutboundBlurOverlay &&
-        (isDownloadingFullImage || (!decryptFinished && !isOutboundPending))
+        !showDownloadProgressOverlay &&
+        !showDownloadCancelledOverlay &&
+        (!decryptFinished && !treatAsOutbound)
 
     Box(
         modifier = Modifier
@@ -660,52 +717,52 @@ private fun ChatImageTileContent(
     ) {
         when {
             else -> {
-                Box(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .background(tilePlaceholderColor),
-                )
-                if (fullBitmap == null && hasLocalSource && !showOutboundBlurOverlay) {
-                    AsyncImage(
-                        model = displayLocalUri,
-                        contentDescription = null,
-                        contentScale = imageContentScale,
-                        modifier = Modifier.fillMaxSize(),
-                    )
-                }
-                thumbBitmap?.let { thumb ->
-                    Box(
-                        modifier = Modifier
-                            .fillMaxSize()
-                            .then(
-                                if (thumbBlurAlpha.value > 0.01f) {
-                                    Modifier.hazeEffect(style = HazeMaterials.thin())
-                                } else {
-                                    Modifier
-                                },
-                            ),
-                    ) {
-                        CachedAttachmentImage(
-                            bitmap = thumb,
-                            contentDescription = serverFile?.name,
-                            contentScale = imageContentScale,
-                            modifier = Modifier
-                                .fillMaxSize()
-                                .alpha(thumbBlurAlpha.value.coerceIn(0f, 1f)),
-                        )
+                AnimatedContent(
+                    targetState = tileVisual,
+                    modifier = Modifier.fillMaxSize(),
+                    transitionSpec = {
+                        fadeIn(tween(BLUR_FADE_MS, easing = FastOutSlowInEasing))
+                            .togetherWith(fadeOut(tween(BLUR_FADE_MS, easing = FastOutSlowInEasing)))
+                    },
+                    label = "attachment_tile_image",
+                ) { visual ->
+                    when (visual) {
+                        AttachmentTileVisual.Empty -> {
+                            Box(
+                                modifier = Modifier
+                                    .fillMaxSize()
+                                    .background(tilePlaceholderColor),
+                            )
+                        }
+                        AttachmentTileVisual.Thumb -> {
+                            placeholderBitmap?.let { thumb ->
+                                Box(
+                                    modifier = Modifier
+                                        .fillMaxSize()
+                                        .hazeEffect(style = HazeMaterials.thin()),
+                                ) {
+                                    CachedAttachmentImage(
+                                        bitmap = thumb,
+                                        contentDescription = serverFile?.name,
+                                        contentScale = imageContentScale,
+                                        modifier = Modifier.fillMaxSize(),
+                                    )
+                                }
+                            }
+                        }
+                        AttachmentTileVisual.Full -> {
+                            fullBitmap?.let { full ->
+                                CachedAttachmentImage(
+                                    bitmap = full,
+                                    contentDescription = serverFile?.name,
+                                    contentScale = imageContentScale,
+                                    modifier = Modifier.fillMaxSize(),
+                                )
+                                LaunchedEffect(full) { onFullyLoaded(true) }
+                            }
+                        }
                     }
                 }
-                fullBitmap?.let { full ->
-                    CachedAttachmentImage(
-                        bitmap = full,
-                        contentDescription = serverFile?.name,
-                        contentScale = imageContentScale,
-                        modifier = Modifier
-                            .fillMaxSize()
-                            .alpha(fullRevealAlpha.value.coerceIn(0f, 1f)),
-                    )
-                    LaunchedEffect(full) { onFullyLoaded(true) }
-                }
                 AnimatedVisibility(
                     visible = showDownloadProgressOverlay,
                     enter = scaleIn(
@@ -766,7 +823,7 @@ private fun ChatImageTileContent(
                         modifier = Modifier.fillMaxSize(),
                         contentAlignment = Alignment.Center,
                     ) {
-                        IndefiniteCircularProgress(modifier = Modifier.size(28.dp))
+                        ExpressiveUploadIndicator(uploadProgress = null, modifier = Modifier.size(28.dp))
                     }
                 }
                 if (showLoadFailedOverlay) {
@@ -785,8 +842,12 @@ private fun ChatImageTileContent(
         }
         if (showOutboundBlurOverlay && outboundOverlayAlpha.value > 0.01f) {
             UploadingImageOverlay(
-                model = localUri ?: displayLocalUri!!,
-                uploadProgress = if (isUploading || awaitingServerAck) uploadProgress else null,
+                model = localUri ?: displayLocalUri,
+                previewBitmap = fullBitmap,
+                uploadProgress = when {
+                    isUploading || awaitingServerAck -> uploadProgress ?: 0
+                    else -> null
+                },
                 clipShape = clipShape,
                 contentScale = imageContentScale,
                 onCancelUpload = if (isUploading && !awaitingServerAck) onCancelUpload else null,
@@ -795,7 +856,7 @@ private fun ChatImageTileContent(
                     .alpha(outboundOverlayAlpha.value),
             )
         }
-        if (isOutboundPending && !uploadError.isNullOrBlank() && onRetryUpload != null) {
+        if (treatAsOutbound && !uploadError.isNullOrBlank() && onRetryUpload != null) {
             AttachmentUploadFailedOverlay(
                 isAuthor = isAuthor,
                 errorKey = uploadError,
@@ -849,7 +910,8 @@ private fun DownloadCancelledImageOverlay(
 @OptIn(ExperimentalHazeMaterialsApi::class)
 @Composable
 private fun UploadingImageOverlay(
-    model: String,
+    model: String?,
+    previewBitmap: ImageBitmap?,
     uploadProgress: Int?,
     clipShape: RoundedCornerShape,
     contentScale: ContentScale = ContentScale.Fit,
@@ -863,18 +925,35 @@ private fun UploadingImageOverlay(
                 .clip(clipShape)
                 .hazeEffect(style = HazeMaterials.thin())
         ) {
-            AsyncImage(
-                model = model,
-                contentDescription = null,
-                modifier = Modifier.fillMaxSize(),
-                contentScale = contentScale,
-            )
+            when {
+                previewBitmap != null -> {
+                    CachedAttachmentImage(
+                        bitmap = previewBitmap,
+                        contentDescription = null,
+                        contentScale = contentScale,
+                        modifier = Modifier.fillMaxSize(),
+                    )
+                }
+                !model.isNullOrBlank() -> {
+                    AsyncImage(
+                        model = model,
+                        contentDescription = null,
+                        modifier = Modifier.fillMaxSize(),
+                        contentScale = contentScale,
+                    )
+                }
+                else -> {
+                    Box(
+                        Modifier
+                            .fillMaxSize()
+                            .background(MaterialTheme.colorScheme.surfaceContainerHigh),
+                    )
+                }
+            }
         }
         Box(
-            modifier = Modifier
-                .matchParentSize()
-                .padding(16.dp),
-            contentAlignment = Alignment.Center
+            modifier = Modifier.fillMaxSize(),
+            contentAlignment = Alignment.Center,
         ) {
             if (onCancelUpload != null) {
                 CancellableAttachmentProgressIndicator(
@@ -903,8 +982,10 @@ internal fun ExpressiveUploadIndicator(
 ) {
     // Latch first percent so we do not swap indeterminate ↔ determinate indicators (that resets animation).
     var latchedPercent by remember { mutableStateOf<Int?>(null) }
-    if (uploadProgress != null) {
-        latchedPercent = uploadProgress.coerceIn(0, 100)
+    LaunchedEffect(uploadProgress) {
+        if (uploadProgress != null) {
+            latchedPercent = uploadProgress.coerceIn(0, 100)
+        }
     }
     val clampedProgress = latchedPercent
     val indeterminate = clampedProgress == null
@@ -930,9 +1011,12 @@ internal fun ExpressiveUploadIndicator(
     val defaultIndicatorAmplitude = WavyProgressIndicatorDefaults.indicatorAmplitude
 
     Box(modifier = modifier, contentAlignment = Alignment.Center) {
+        val indicatorModifier = Modifier
+            .fillMaxHeight()
+            .aspectRatio(1f)
         if (indeterminate) {
             CircularWavyProgressIndicator(
-                modifier = Modifier.fillMaxSize(),
+                modifier = indicatorModifier,
                 color = primary,
                 trackColor = trackColor,
                 amplitude = animatedWaveStrength
@@ -940,7 +1024,7 @@ internal fun ExpressiveUploadIndicator(
         } else {
             CircularWavyProgressIndicator(
                 progress = { animatedProgress },
-                modifier = Modifier.fillMaxSize(),
+                modifier = indicatorModifier,
                 color = primary,
                 trackColor = trackColor,
                 amplitude = { p -> animatedWaveStrength * defaultIndicatorAmplitude(p) }
@@ -984,6 +1068,7 @@ private fun PendingImageContent(
                 if (uploading) {
                     UploadingImageOverlay(
                         model = uri,
+                        previewBitmap = null,
                         uploadProgress = uploadProgress,
                         clipShape = attachmentImageCornerShape(isAuthor = false),
                         modifier = Modifier.matchParentSize(),
@@ -999,14 +1084,10 @@ private fun PendingImageContent(
             contentAlignment = Alignment.Center
         ) {
             if (isUploading) {
-                if (uploadProgress != null) {
-                    DeterminateCircularProgress(
-                        progress = uploadProgress,
-                        modifier = Modifier.size(40.dp)
-                    )
-                } else {
-                    IndefiniteCircularProgress(modifier = Modifier.size(40.dp))
-                }
+                ExpressiveUploadIndicator(
+                    uploadProgress = uploadProgress,
+                    modifier = Modifier.size(40.dp),
+                )
             } else {
                 Icon(
                     imageVector = Icons.Rounded.AttachFile,
@@ -1019,34 +1100,6 @@ private fun PendingImageContent(
     }
 }
 
-@Composable
-private fun IndefiniteCircularProgress(modifier: Modifier = Modifier) {
-    CircularProgressIndicator(
-        modifier = modifier,
-        strokeWidth = 3.dp
-    )
-}
-
-@Composable
-private fun DeterminateCircularProgress(
-    progress: Int,
-    modifier: Modifier = Modifier
-) {
-    val animatedProgress by animateFloatAsState(
-        targetValue = (progress.coerceIn(0, 100) / 100f),
-        animationSpec = tween(
-            durationMillis = 250,
-            easing = FastOutSlowInEasing
-        ),
-        label = "uploadProgress"
-    )
-    CircularProgressIndicator(
-        progress = { animatedProgress },
-        modifier = modifier,
-        strokeWidth = 3.dp
-    )
-}
-
 @Composable
 internal fun CachedAttachmentImage(
     bitmap: ImageBitmap,

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/ChatInput.kt

@@ -239,7 +239,7 @@ fun ChatInput(
     onClearReply: () -> Unit,
     onClearEdit: () -> Unit,
     hazeState: HazeState,
-    recipientId: Int? = null,
+    supportsAttachments: Boolean = false,
     currentUserId: Int? = null,
     isReadOnly: Boolean = false,
     onReadOnlyMessageClick: () -> Unit = {},
@@ -477,7 +477,7 @@ fun ChatInput(
                                 },
                             )
 
-                            if (recipientId != null) {
+                            if (supportsAttachments) {
                                 Box(
                                     modifier = Modifier
                                         .padding(vertical = ChatInputIconSlotVerticalInset)

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/ChatPanel.kt

@@ -9,15 +9,19 @@ import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import kotlinx.serialization.Serializable
 import ru.fromchat.api.ApiClient
+import ru.fromchat.api.local.AttachmentMediaLog
 import ru.fromchat.api.local.messages.generateClientMessageId
 import ru.fromchat.api.local.messages.nowMessageTimestampIso
 import ru.fromchat.api.local.messages.sortMessagesForChatDisplay
 import ru.fromchat.api.local.send.OutgoingMessageCoordinator
 import ru.fromchat.api.schema.messages.Message
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
 import ru.fromchat.api.schema.websocket.WebSocketMessage
 import ru.fromchat.Logger
 import ru.fromchat.api.local.send.clearOutboundFileCaches
 import ru.fromchat.api.local.send.clearOutboundImageCaches
+import ru.fromchat.api.local.db.isPlaceholderAttachmentAspectRatio
+import ru.fromchat.api.local.db.isPlaceholderAttachmentDimensions
 import ru.fromchat.ui.chat.utils.TypingHandler
 import ru.fromchat.ui.chat.utils.TypingUser
 import ru.fromchat.ui.chat.utils.dedupeMessagesByClientId
@@ -43,7 +47,9 @@ data class ChatPanelState(
     /** Public chat: registered user count; null until first successful load or WS update. */
     val publicGroupMemberCount: Int? = null,
     /** Public chat: true until first count response (HTTP or WebSocket). */
-    val publicGroupMetaLoading: Boolean = false
+    val publicGroupMetaLoading: Boolean = false,
+    /** Dissolve keys ([messageDissolveKey]) currently playing the Thanos delete/cancel animation. */
+    val dissolvingMessageKeys: Set<String> = emptySet(),
 )
 
 @Serializable
@@ -242,11 +248,7 @@ abstract class ChatPanel(
     open suspend fun cancelQueuedMessage(message: Message) {
         val cid = message.client_message_id?.trim().orEmpty()
         if (cid.isEmpty()) return
-        if (message.pendingFileUri != null) {
-            clearOutboundImageCaches(cid, message.id)
-            clearOutboundFileCaches(cid, message.id)
-        }
-        removeMessage(message.id)
+        if (!beginMessageDissolve(message)) return
         OutgoingMessageCoordinator.cancelOutboundMessage(cid, outboxConversationId())
     }
 
@@ -259,6 +261,59 @@ abstract class ChatPanel(
         cancelQueuedMessage(message)
     }
 
+    /**
+     * Starts fade+collapse exit animation. Returns false if already exiting.
+     * [finishDissolveAnimation] removes the row when the animation completes (or on timeout).
+     */
+    fun beginMessageDissolve(message: Message): Boolean {
+        val key = messageDissolveKey(message)
+        if (key in _state.dissolvingMessageKeys) return false
+        if (_state.messages.none { messageDissolveKey(it) == key }) return false
+        updateState { state ->
+            state.copy(dissolvingMessageKeys = state.dissolvingMessageKeys + key)
+        }
+        // Off-screen / missed capture: still remove after the dissolve window.
+        scope.launch {
+            delay(messageExitDurationMs().toLong())
+            if (key in _state.dissolvingMessageKeys) {
+                finishDissolveAnimation(key)
+            }
+        }
+        return true
+    }
+
+    /** Called when the exit animation completes (or as a timeout fallback). */
+    fun finishDissolveAnimation(dissolveKey: String) {
+        val key = dissolveKey.trim()
+        if (key.isEmpty()) return
+        val message = _state.messages.find { messageDissolveKey(it) == key }
+        updateState { state ->
+            state.copy(
+                messages = state.messages.filter { messageDissolveKey(it) != key },
+                dissolvingMessageKeys = state.dissolvingMessageKeys - key,
+            )
+        }
+        if (message == null) return
+        if (message.id > 0) clearReplyReferencesTo(message.id)
+        scope.launch(Dispatchers.Default) {
+            val cid = message.client_message_id?.trim().orEmpty()
+            if (message.pendingFileUri != null && cid.isNotEmpty()) {
+                clearOutboundImageCaches(cid, message.id)
+                clearOutboundFileCaches(cid, message.id)
+            }
+            if (message.id < 0 || !message.pendingFileUri.isNullOrBlank()) {
+                runCatching { removeOptimisticFromCache(message) }
+            }
+        }
+    }
+
+    /** @deprecated Use [finishDissolveAnimation]. */
+    fun finishExitAnimation(clientMessageId: String) {
+        val cid = clientMessageId.trim()
+        if (cid.isEmpty()) return
+        finishDissolveAnimation("c:$cid")
+    }
+
     /**
      * Remove message from list
      */
@@ -329,11 +384,20 @@ abstract class ChatPanel(
     }
 
     /**
-     * Handle message confirmation (replace temp message with confirmed)
+     * Handle message confirmation (replace temp message with confirmed).
+     * Preserves local attachment preview fields so the tile does not flash failed/loading.
      */
     fun handleMessageConfirmed(tempId: String, confirmedMessage: Message) {
         val pending = pendingMessages.remove(tempId)
         pending?.first?.cancel()
+        AttachmentMediaLog.send(
+            "confirm_start",
+            "job" to tempId.take(12),
+            "realId" to confirmedMessage.id,
+            "files" to (confirmedMessage.files?.size ?: 0),
+            "pendingUri" to (_state.messages.find { it.client_message_id == tempId }
+                ?.pendingFileUri?.take(48) ?: "null"),
+        )
 
         updateState { currentState ->
             val optimistic = currentState.messages.find { it.client_message_id == tempId }
@@ -343,12 +407,32 @@ abstract class ChatPanel(
             } else {
                 confirmedMessage
             }
-            val resolvedConfirmed = if (withClientId.reply_to == null) {
+            val withReply = if (withClientId.reply_to == null) {
                 val reply = optimistic?.reply_to
                 if (reply != null) withClientId.copy(reply_to = reply) else withClientId
             } else {
                 withClientId
             }
+            val resolvedConfirmed = mergeConfirmedAttachmentUi(optimistic, withReply)
+            AttachmentMediaLog.send(
+                "confirm_merged",
+                "job" to tempId.take(12),
+                "realId" to resolvedConfirmed.id,
+                "keepPreview" to (resolvedConfirmed.pendingFileUri?.take(48) ?: "null"),
+                "thumbs" to (resolvedConfirmed.fileThumbnails?.size ?: 0),
+            )
+            AttachmentMediaLog.aspect(
+                "confirm_merged",
+                "job" to tempId.take(12),
+                "realId" to resolvedConfirmed.id,
+                "pairs" to resolvedConfirmed.fileAspectRatioPairs?.firstOrNull(),
+                "dims" to resolvedConfirmed.fileDimensions?.firstOrNull(),
+                "ratios" to resolvedConfirmed.fileAspectRatios?.firstOrNull(),
+                "pendingAspect" to resolvedConfirmed.pendingFileAspectRatio,
+                "optAspect" to optimistic?.pendingFileAspectRatio,
+                "optDims" to optimistic?.fileDimensions?.firstOrNull(),
+                "serverPairs" to withReply.fileAspectRatioPairs?.firstOrNull(),
+            )
             val withoutDupReal = if (resolvedConfirmed.id > 0) {
                 currentState.messages.filter { it.id != resolvedConfirmed.id }
             } else {
@@ -369,10 +453,122 @@ abstract class ChatPanel(
             )
         }
         scope.launch(Dispatchers.Default) {
-            val resolved = _state.messages.find { it.client_message_id == tempId }
-                ?: _state.messages.find { it.id == confirmedMessage.id }
-            val toPersist = resolved ?: confirmedMessage
+            val optimistic = pending?.second
+                ?: _state.messages.find { it.client_message_id == tempId }
+            val resolvedForSeed = _state.messages.find { it.client_message_id == tempId }
+                ?: confirmedMessage
+            seedConfirmedAttachmentCaches(tempId, optimistic, resolvedForSeed)
+            AttachmentMediaLog.send(
+                "confirm_seeded",
+                "job" to tempId.take(12),
+                "realId" to resolvedForSeed.id,
+            )
+            val toPersist = resolvedForSeed
             runCatching { onOptimisticMessageConfirmed(tempId, toPersist) }
+            AttachmentMediaLog.send(
+                "confirm_done",
+                "job" to tempId.take(12),
+                "realId" to confirmedMessage.id,
+            )
+        }
+    }
+
+    /**
+     * Keep the outbound local preview on the confirmed row (DM + public) so confirm is a
+     * blur-fade, not a failed/loading flash.
+     */
+    protected fun mergeConfirmedAttachmentUi(optimistic: Message?, confirmed: Message): Message {
+        if (optimistic == null) return confirmed
+        val hasFiles = !confirmed.files.isNullOrEmpty()
+        if (!hasFiles && optimistic.pendingFileUri == null) return confirmed
+        val localPreview = optimistic.pendingFileUri
+        val primaryName = confirmed.files?.firstOrNull()?.name
+            ?: optimistic.pendingFilename
+            ?: localPreview?.substringAfterLast('/')?.substringBefore('?')
+        val isImage = primaryName != null && isImageFilename(primaryName)
+        val serverDim = confirmed.fileDimensions?.firstOrNull()
+            ?: confirmed.fileAspectRatioPairs?.firstOrNull()?.takeIf { it.size >= 2 }?.let { (w, h) -> w to h }
+        val serverRatio = confirmed.fileAspectRatios?.firstOrNull()
+        val serverAspect = serverRatio
+            ?: serverDim?.let { (w, h) -> if (h > 0) w.toFloat() / h.toFloat() else null }
+        val serverPairList = confirmed.fileAspectRatioPairs?.firstOrNull()
+        val serverHasRealDims = serverPairList?.let { pair ->
+            pair.size >= 2 && !isPlaceholderAttachmentDimensions(pair[0], pair[1])
+        } == true || serverDim?.let { (w, h) ->
+            !isPlaceholderAttachmentDimensions(w, h)
+        } == true
+        val keepLocalAspect = isImage && !serverHasRealDims && (
+            optimistic.pendingFileAspectRatio != null ||
+                optimistic.fileDimensions?.firstOrNull()?.let { (w, h) ->
+                    !isPlaceholderAttachmentDimensions(w, h)
+                } == true
+            )
+        val merged = confirmed.copy(
+            pendingFileUri = when {
+                isImage -> localPreview
+                else -> null
+            },
+            pendingFilename = null,
+            pendingFileAspectRatio = when {
+                keepLocalAspect -> optimistic.pendingFileAspectRatio ?: serverAspect
+                isImage -> null
+                else -> null
+            },
+            fileAspectRatios = when {
+                keepLocalAspect -> optimistic.pendingFileAspectRatio?.let { listOf(it) }
+                    ?: optimistic.fileAspectRatios
+                    ?: confirmed.fileAspectRatios
+                else -> confirmed.fileAspectRatios
+                    ?: optimistic.pendingFileAspectRatio?.takeIf { !serverHasRealDims }?.let { listOf(it) }
+                    ?: optimistic.fileAspectRatios
+            },
+            fileDimensions = when {
+                keepLocalAspect -> optimistic.fileDimensions ?: confirmed.fileDimensions
+                else -> confirmed.fileDimensions ?: optimistic.fileDimensions
+            },
+            fileSizes = confirmed.fileSizes ?: optimistic.fileSizes,
+            fileThumbnails = confirmed.fileThumbnails ?: optimistic.fileThumbnails,
+            uploadJobId = null,
+            uploadProgress = null,
+            uploadError = null,
+        )
+        return if (hasFiles) merged.resolvePublicAttachmentLayout() else merged
+    }
+
+    protected open suspend fun seedConfirmedAttachmentCaches(
+        clientMessageId: String,
+        optimistic: Message?,
+        confirmed: Message,
+    ) {
+        val cid = clientMessageId.trim()
+        if (cid.isEmpty() || confirmed.id <= 0) return
+        val localUri = optimistic?.pendingFileUri?.trim()?.takeIf { it.isNotEmpty() } ?: return
+        val file = confirmed.files?.firstOrNull() ?: return
+        if (isImageFilename(file.name)) {
+            ru.fromchat.api.local.cache.DecryptedImageCache.seedFromLocalFile(
+                messageId = confirmed.id,
+                fileIndex = 0,
+                localFileUri = localUri,
+                clientMessageId = cid,
+            )
+            ru.fromchat.api.local.cache.DecryptedImageCache.ensureDiskAliasForMessageId(
+                messageId = confirmed.id,
+                fileIndex = 0,
+                clientMessageId = cid,
+            )
+        } else {
+            ru.fromchat.api.local.send.seedOutboundFileAsDownloaded(
+                messageId = confirmed.id,
+                fileIndex = 0,
+                localFileUri = localUri,
+                displayFilename = file.name,
+                clientMessageId = cid,
+            )
+            ru.fromchat.api.local.cache.DecryptedFileCache.ensureDiskAliasForMessageId(
+                messageId = confirmed.id,
+                fileIndex = 0,
+                clientMessageId = cid,
+            )
         }
     }
 
@@ -560,6 +756,10 @@ abstract class ChatPanel(
     /** DM recipient ID for attachment uploads; null for non-DM panels. */
     open fun getRecipientId(): Int? = null
 
+    /** Whether the composer may attach images/files (DM when recipient is known, or public chat). */
+    open val supportsAttachments: Boolean
+        get() = getRecipientId() != null
+
     open val showUsernamesInMessages: Boolean
         get() = true
 

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/ChatScreen.kt

@@ -36,6 +36,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateMapOf
 import androidx.compose.runtime.mutableStateOf
@@ -82,6 +83,7 @@ import ru.fromchat.Logger
 import ru.fromchat.Res
 import ru.fromchat.api.ApiClient
 import ru.fromchat.api.calls.CallStore
+import ru.fromchat.api.local.AttachmentMediaLog
 import ru.fromchat.api.local.WebSocketManager
 import ru.fromchat.api.local.db.store.ConnectionStateStore
 import ru.fromchat.api.local.db.store.ConnectionStatus
@@ -212,15 +214,44 @@ fun ChatScreen(
         mutableStateOf(setOf<String>())
     }
     // Visit-scoped (not saveable): reopen must re-seed history, never replay enter.
-    var lastAnimatedMessageKeys by remember(panelId) { mutableStateOf(setOf<String>()) }
-    var knownEnterIdentities by remember(panelId) { mutableStateOf(setOf<String>()) }
+    val openingMessages = remember(panelId) { panel.getState().messages }
+    val mountSnapshotKeys = remember(panelId) {
+        openingMessages.mapTo(mutableSetOf()) { messageListKey(it) }.toSet()
+    }
+    val mountSnapshotIdentities = remember(panelId) {
+        openingMessages.mapTo(mutableSetOf()) { messageEnterIdentity(it) }.toSet()
+    }
+    var lastAnimatedMessageKeys by remember(panelId) { mutableStateOf(mountSnapshotKeys) }
+    var knownEnterIdentities by remember(panelId) { mutableStateOf(mountSnapshotIdentities) }
+    var enterAnimationsSeeded by remember(panelId) {
+        mutableStateOf(mountSnapshotKeys.isNotEmpty())
+    }
+    // Blocks composition-only enter before the first LaunchedEffect seed on this visit.
+    var visitEnterSyncComplete by remember(panelId) {
+        mutableStateOf(mountSnapshotKeys.isNotEmpty())
+    }
     val enterCoordinator = remember(panelId) { MessageEnterCoordinator(scope) }
     val activeEnterAnimation by enterCoordinator.currentItem.collectAsState()
     val pendingNewMessageKeys by enterCoordinator.pendingNewMessageKeys.collectAsState()
     val queuedEnter by enterCoordinator.queuedEnter.collectAsState()
     var previousNewestFingerprint by remember(panelId) { mutableStateOf("") }
     var previousEnterMessageCount by remember(panelId) { mutableIntStateOf(0) }
-    var enterAnimationsSeeded by remember(panelId) { mutableStateOf(false) }
+
+    LaunchedEffect(panelId) {
+        val initial = panel.getState().messages
+        if (initial.isEmpty()) return@LaunchedEffect
+        val presentKeys = initial.mapTo(mutableSetOf()) { messageListKey(it) }
+        val presentIdentities = initial.mapTo(mutableSetOf()) { messageEnterIdentity(it) }
+        lastAnimatedMessageKeys = presentKeys
+        knownEnterIdentities = presentIdentities
+        enterAnimationsSeeded = true
+        visitEnterSyncComplete = true
+        previousEnterMessageCount = initial.size
+        val newest = initial.lastOrNull()
+        if (newest != null) {
+            previousNewestFingerprint = "${messageListKey(newest)}|${initial.size}"
+        }
+    }
 
     LaunchedEffect(panelState.messages) {
         val messages = panelState.messages
@@ -255,6 +286,7 @@ fun ChatScreen(
             previousNewestFingerprint = fingerprint
             previousEnterMessageCount = messages.size
             enterAnimationsSeeded = true
+            visitEnterSyncComplete = true
         }
 
         // First non-empty load for this visit: never animate existing history.
@@ -299,6 +331,10 @@ fun ChatScreen(
             seedWithoutAnimating("skip_new_not_newest")
             return@LaunchedEffect
         }
+        if (newestKey in mountSnapshotKeys || newestIdentity in mountSnapshotIdentities) {
+            seedWithoutAnimating("skip_opening_snapshot")
+            return@LaunchedEffect
+        }
         if (newestKey in lastAnimatedMessageKeys || newestIdentity in knownEnterIdentities) {
             seedWithoutAnimating("skip_already_known")
             return@LaunchedEffect
@@ -658,26 +694,47 @@ fun ChatScreen(
     }
 
     LaunchedEffect(panel) {
-        if (panel.getRecipientId() != null) {
+        if (panel.supportsAttachments) {
             AttachmentUploadNotifier.progressFlow.collect { progress ->
                 when (progress) {
-                    is AttachmentUploadProgress.Pending ->
+                    is AttachmentUploadProgress.Pending -> {
+                        AttachmentMediaLog.send(
+                            "ui_progress_pending",
+                            "job" to progress.jobId.take(12),
+                        )
                         panel.updateMessageByClientMessageId(progress.jobId) {
                             it.copy(uploadProgress = 0, uploadError = null)
                         }
+                    }
 
-                    is AttachmentUploadProgress.InProgress ->
+                    is AttachmentUploadProgress.InProgress -> {
+                        AttachmentMediaLog.send(
+                            "ui_progress_apply",
+                            "job" to progress.jobId.take(12),
+                            "pct" to progress.percent,
+                        )
                         panel.updateMessageByClientMessageId(progress.jobId) {
                             it.copy(uploadProgress = progress.percent, uploadError = null)
                         }
+                    }
 
-                    is AttachmentUploadProgress.Success ->
+                    is AttachmentUploadProgress.Success -> {
+                        AttachmentMediaLog.send(
+                            "ui_progress_success",
+                            "job" to progress.jobId.take(12),
+                        )
                         panel.updateMessageByClientMessageId(progress.jobId) {
                             it.copy(uploadProgress = null)
                         }
+                    }
 
                     is AttachmentUploadProgress.Failed -> {
                         if (progress.error == "Cancelled") return@collect
+                        AttachmentMediaLog.send(
+                            "ui_progress_failed",
+                            "job" to progress.jobId.take(12),
+                            "err" to progress.error,
+                        )
                         panel.updateMessageByClientMessageId(progress.jobId) {
                             it.copy(uploadProgress = null, uploadError = progress.error)
                         }
@@ -756,12 +813,21 @@ fun ChatScreen(
                                 scope.launch {
                                     val replyToId = replyTo?.id?.takeIf { it > 0 }
                                     val recipientId = panel.getRecipientId()
-                                    if (attachments.isNotEmpty() && recipientId != null) {
+                                    if (attachments.isNotEmpty() && panel.supportsAttachments) {
                                         val plaintext = text.ifBlank { "" }
                                         attachments.forEach { att ->
                                             val jobId = generateClientMessageId()
                                             val tempId = optimisticMessageIdForClientMessageId(jobId)
                                             val isImage = att.isImage
+                                            val sendT0 = AttachmentMediaLog.nowMs()
+                                            AttachmentMediaLog.send(
+                                                "tap_send",
+                                                "job" to jobId.take(12),
+                                                "image" to isImage,
+                                                "file" to att.filename,
+                                                "uri" to att.uri.take(64),
+                                                "public" to (recipientId == null),
+                                            )
                                             scope.launch(Dispatchers.Default) {
                                                 val imageDimensions = if (isImage) {
                                                     getImageDimensions(att.uri)
@@ -776,6 +842,13 @@ fun ChatScreen(
                                                     } else {
                                                         null
                                                     }
+                                                AttachmentMediaLog.send(
+                                                    "staging_start",
+                                                    "job" to jobId.take(12),
+                                                    "dims" to imageDimensions,
+                                                    "aspect" to aspectRatio,
+                                                    "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                )
                                                 val staged = if (isImage) {
                                                     prepareOutboundImageForSend(
                                                         clientMessageId = jobId,
@@ -792,9 +865,24 @@ fun ChatScreen(
                                                     )
                                                 }
                                                 if (staged == null) {
+                                                    AttachmentMediaLog.send(
+                                                        "staging_failed",
+                                                        "job" to jobId.take(12),
+                                                        "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                    )
                                                     return@launch
                                                 }
-                                                val fileUri = staged.stagedUri
+                                                AttachmentMediaLog.send(
+                                                    "staging_ok",
+                                                    "job" to jobId.take(12),
+                                                    "bytes" to staged.sizeBytes,
+                                                    "preview" to (staged.previewUri?.take(48) ?: "null"),
+                                                    "staged" to staged.stagedUri.take(48),
+                                                    "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                )
+                                                val uploadUri = staged.stagedUri
+                                                val previewUri = staged.previewUri?.takeIf { it.isNotBlank() }
+                                                    ?: staged.stagedUri
                                                 val optimisticMessage = Message(
                                                     id = tempId,
                                                     user_id = currentUserId ?: -1,
@@ -809,7 +897,7 @@ fun ChatScreen(
                                                     client_message_id = jobId,
                                                     reactions = null,
                                                     files = null,
-                                                    pendingFileUri = fileUri,
+                                                    pendingFileUri = previewUri,
                                                     pendingFilename = att.filename,
                                                     uploadJobId = jobId,
                                                     uploadProgress = 0,
@@ -819,6 +907,13 @@ fun ChatScreen(
                                                 )
                                                 withContext(Dispatchers.Main) {
                                                     panel.addMessage(optimisticMessage)
+                                                    AttachmentMediaLog.send(
+                                                        "optimistic_added",
+                                                        "job" to jobId.take(12),
+                                                        "tempId" to tempId,
+                                                        "pendingUri" to previewUri.take(48),
+                                                        "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                    )
                                                 }
                                                 AttachmentUploadNotifier.emit(
                                                     AttachmentUploadProgress.InProgress(
@@ -828,16 +923,45 @@ fun ChatScreen(
                                                     ),
                                                     messageLabel = plaintext,
                                                 )
-                                                OutgoingMessageCoordinator.enqueueDmAttachment(
-                                                    recipientId = recipientId,
-                                                    plaintext = plaintext,
-                                                    clientMessageId = jobId,
-                                                    replyToId = replyToId,
-                                                    fileUri = fileUri,
-                                                    filename = att.filename,
-                                                    optimisticMessage = optimisticMessage,
-                                                    aspectRatio = staged.aspectRatio ?: aspectRatio,
-                                                    fileSizeBytes = staged.sizeBytes,
+                                                if (recipientId != null) {
+                                                    AttachmentMediaLog.send(
+                                                        "enqueue_dm",
+                                                        "job" to jobId.take(12),
+                                                        "peer" to recipientId,
+                                                        "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                    )
+                                                    OutgoingMessageCoordinator.enqueueDmAttachment(
+                                                        recipientId = recipientId,
+                                                        plaintext = plaintext,
+                                                        clientMessageId = jobId,
+                                                        replyToId = replyToId,
+                                                        fileUri = uploadUri,
+                                                        filename = att.filename,
+                                                        optimisticMessage = optimisticMessage,
+                                                        aspectRatio = staged.aspectRatio ?: aspectRatio,
+                                                        fileSizeBytes = staged.sizeBytes,
+                                                    )
+                                                } else {
+                                                    AttachmentMediaLog.send(
+                                                        "enqueue_public",
+                                                        "job" to jobId.take(12),
+                                                        "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
+                                                    )
+                                                    OutgoingMessageCoordinator.enqueuePublicAttachment(
+                                                        content = plaintext,
+                                                        clientMessageId = jobId,
+                                                        replyToId = replyToId,
+                                                        fileUri = uploadUri,
+                                                        filename = att.filename,
+                                                        optimisticMessage = optimisticMessage,
+                                                        aspectRatio = staged.aspectRatio ?: aspectRatio,
+                                                        fileSizeBytes = staged.sizeBytes,
+                                                    )
+                                                }
+                                                AttachmentMediaLog.send(
+                                                    "enqueue_done",
+                                                    "job" to jobId.take(12),
+                                                    "elapsedMs" to (AttachmentMediaLog.nowMs() - sendT0),
                                                 )
                                             }
                                         }
@@ -859,7 +983,7 @@ fun ChatScreen(
                             inputText = ""
                         },
                         hazeState = hazeState,
-                        recipientId = panel.getRecipientId(),
+                        supportsAttachments = panel.supportsAttachments,
                         isReadOnly = isReadOnly,
                         onReadOnlyMessageClick = {
                             if (isReadOnly) {
@@ -948,10 +1072,16 @@ fun ChatScreen(
                                     // Keep the newest bubble as NewMessage before enqueue runs.
                                     val newest = panelState.messages.lastOrNull()
                                     val newestListKey = newest?.let { messageListKey(it) }
+                                    val newestEnterIdentity = newest?.let { messageEnterIdentity(it) }
                                     val compositionPendingNewest =
-                                        enterAnimationsSeeded &&
+                                        visitEnterSyncComplete &&
+                                            enterAnimationsSeeded &&
                                             newestListKey != null &&
+                                            newestEnterIdentity != null &&
+                                            newestListKey !in mountSnapshotKeys &&
+                                            newestEnterIdentity !in mountSnapshotIdentities &&
                                             newestListKey !in lastAnimatedMessageKeys &&
+                                            newestEnterIdentity !in knownEnterIdentities &&
                                             newestListKey !in pendingNewMessageKeys &&
                                             activeEnterAnimation?.newMessageKey != newestListKey
                                     val pendingKeysForRole =
@@ -1041,7 +1171,16 @@ fun ChatScreen(
                                             }
                                             }
                                         },
-                                        enterAnimationRole = enterRole,
+                                        enterAnimationRole = if (!visitEnterSyncComplete) {
+                                            EnterAnimationRole.None
+                                        } else {
+                                            enterRole
+                                        },
+                                        isExiting = messageDissolveKey(message) in
+                                            panelState.dissolvingMessageKeys,
+                                        onExitAnimationFinished = {
+                                            panel.finishDissolveAnimation(messageDissolveKey(message))
+                                        },
                                         modifier = Modifier.padding(top = item.spacingAbove),
                                         isContextMenuOpen = contextMenuState.isOpen,
                                         isContextMenuForThisMessage =

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/ImageFullscreenPreview.kt

@@ -80,7 +80,10 @@ import ru.fromchat.api.local.messages.formatMessageDateTimeLocal
 import ru.fromchat.api.schema.messages.Message
 import ru.fromchat.back
 import ru.fromchat.more
+import ru.fromchat.api.local.send.previewSeedDecodeSize
+import ru.fromchat.ui.chat.utils.attachmentDecodeCacheKeys
 import ru.fromchat.ui.chat.utils.imageAspectRatioForMessage
+import ru.fromchat.ui.chat.utils.peekDecodedAttachmentBitmap
 import ru.fromchat.ui.components.BackHandler
 import ru.fromchat.ui.components.Text
 import kotlin.math.abs
@@ -124,29 +127,39 @@ fun ImageFullscreenPreview(
     val envelope = message.dmEnvelope
 
     val cacheClientId = message.client_message_id?.trim()?.takeIf { it.isNotEmpty() }
-    val decryptCacheKey = remember(message.id, fileIndex, cacheClientId) {
-        DecryptedImageCache.storageKey(message.id, fileIndex, cacheClientId)
+    val decodeCacheKeys = remember(message.id, fileIndex, cacheClientId) {
+        attachmentDecodeCacheKeys(message.id, fileIndex, cacheClientId)
     }
-    val fsCacheKey = remember(decryptCacheKey) {
+    val bitmapStateKey = remember(decodeCacheKeys) { decodeCacheKeys.joinToString("|") }
+    val decryptCacheKey = decodeCacheKeys.first()
+    val fsCacheKey = remember(bitmapStateKey) {
         LocalDecodedImageCache.fullscreenCacheKey(decryptCacheKey)
     }
-    var cachedPath by remember(decryptCacheKey) {
+    var cachedPath by remember(bitmapStateKey) {
         mutableStateOf(DecryptedImageCache.getCached(message.id, fileIndex, cacheClientId))
     }
-    var previewBitmap by remember(decryptCacheKey) {
-        mutableStateOf(LocalDecodedImageCache.peekFull(decryptCacheKey))
+    var previewBitmap by remember(bitmapStateKey) {
+        mutableStateOf(peekDecodedAttachmentBitmap(decodeCacheKeys))
     }
-    var fullscreenBitmap by remember(fsCacheKey) {
-        mutableStateOf(LocalDecodedImageCache.peekFullscreen(decryptCacheKey))
+    var fullscreenBitmap by remember(bitmapStateKey) {
+        mutableStateOf(
+            decodeCacheKeys.firstNotNullOfOrNull { key ->
+                LocalDecodedImageCache.peekFullscreen(key)
+            },
+        )
     }
     val hasInstantBitmap = previewBitmap != null || fullscreenBitmap != null
-    val openAspectFromBitmap = previewBitmap?.let { it.width.toFloat() / it.height.toFloat() }
+    val openAspectFromBitmap = (fullscreenBitmap ?: previewBitmap)?.let {
+        it.width.toFloat() / it.height.toFloat()
+    }
     val layoutAspectHint = imageAspectRatioForMessage(
         fileAspectRatios = message.fileAspectRatios,
         fileDimensions = message.fileDimensions,
         pendingFileAspectRatio = message.pendingFileAspectRatio,
+        fileAspectRatioPairs = message.fileAspectRatioPairs,
         fileIndex = fileIndex,
         confirmed = message.id > 0,
+        hasLocalPreview = !message.pendingFileUri.isNullOrBlank() || cachedPath != null,
     )
     var animationBounds by remember(decryptCacheKey) { mutableStateOf<Rect?>(null) }
     if (animationBounds == null && thumbnailBounds != null) {
@@ -158,7 +171,7 @@ fun ImageFullscreenPreview(
     var menusVisible by remember { mutableStateOf(true) }
     var dismissRequested by remember { mutableStateOf(false) }
     val backgroundAlpha = remember { Animatable(1f) }
-    var hasPlayedOpenAnimation by remember(decryptCacheKey) { mutableStateOf(false) }
+    var hasPlayedOpenAnimation by remember(bitmapStateKey) { mutableStateOf(false) }
     var isOpenAnimationPlaying by remember { mutableStateOf(false) }
     var dismissProgress by remember { mutableStateOf(0f) }
     val isInitialOpenState = animationBounds != null && !hasPlayedOpenAnimation
@@ -205,18 +218,56 @@ fun ImageFullscreenPreview(
                 )
             }
 
-            LaunchedEffect(decryptCacheKey, fsCacheKey, fullscreenDecodeSize) {
-                val uri = cachedPath ?: DecryptedImageCache.getCached(message.id, fileIndex, cacheClientId)
-                    ?: DecryptedImageCache.getOrDecrypt(
-                        messageId = message.id,
-                        fileIndex = fileIndex,
-                        file = file,
-                        envelope = envelope,
-                        currentUserId = currentUserId,
-                        clientMessageId = cacheClientId,
-                        messageLabel = message.content,
-                    ).also { cachedPath = it }
+            LaunchedEffect(bitmapStateKey, fsCacheKey, fullscreenDecodeSize, layoutAspectHint) {
+                if (previewBitmap == null) {
+                    peekDecodedAttachmentBitmap(decodeCacheKeys)?.let { previewBitmap = it }
+                }
+                val existingUri = cachedPath
+                    ?: DecryptedImageCache.getCached(message.id, fileIndex, cacheClientId)
+                if (previewBitmap == null && existingUri != null) {
+                    cachedPath = existingUri
+                    val quick = withContext(Dispatchers.Default) {
+                        LocalDecodedImageCache.loadFull(
+                            decryptCacheKey,
+                            existingUri.removePrefix("file://"),
+                            previewSeedDecodeSize(layoutAspectHint),
+                        )
+                    }
+                    if (quick != null) previewBitmap = quick
+                }
+                val uri = cachedPath ?: (
+                    if (envelope != null) {
+                        DecryptedImageCache.getOrDecrypt(
+                            messageId = message.id,
+                            fileIndex = fileIndex,
+                            file = file,
+                            envelope = envelope,
+                            currentUserId = currentUserId,
+                            clientMessageId = cacheClientId,
+                            messageLabel = message.content,
+                        )
+                    } else {
+                        DecryptedImageCache.getOrDownloadPlain(
+                            messageId = message.id,
+                            fileIndex = fileIndex,
+                            file = file,
+                            clientMessageId = cacheClientId,
+                            messageLabel = message.content,
+                        )
+                    }
+                )?.also { cachedPath = it }
                 if (uri == null) return@LaunchedEffect
+                if (previewBitmap == null) {
+                    val tilePreview = withContext(Dispatchers.Default) {
+                        LocalDecodedImageCache.loadFull(
+                            decryptCacheKey,
+                            uri.removePrefix("file://"),
+                            previewSeedDecodeSize(layoutAspectHint),
+                        )
+                    }
+                    if (tilePreview != null) previewBitmap = tilePreview
+                }
+                if (fullscreenBitmap != null) return@LaunchedEffect
                 val hiRes = withContext(Dispatchers.Default) {
                     LocalDecodedImageCache.loadFullscreen(decryptCacheKey, uri, fullscreenDecodeSize)
                 }
@@ -226,17 +277,12 @@ fun ImageFullscreenPreview(
             }
 
             val displayBitmap = fullscreenBitmap ?: previewBitmap
-            val displayAspect = displayBitmap?.let { bmp ->
-                bmp.width.toFloat() / bmp.height.toFloat()
-            } ?: message.fileAspectRatios?.getOrNull(fileIndex)?.takeIf { it > 0f }
-            val contentHeightAtScale1 = if (displayAspect != null) {
-                containerWidth / displayAspect
-            } else {
-                containerHeight
-            }
+            val hasLocalFile = cachedPath != null ||
+                !message.pendingFileUri.isNullOrBlank() ||
+                DecryptedImageCache.getCached(message.id, fileIndex, cacheClientId) != null
 
             when {
-                displayBitmap == null -> {
+                displayBitmap == null && !hasLocalFile -> {
                     Box(
                         modifier = Modifier
                             .fillMaxSize()
@@ -253,6 +299,9 @@ fun ImageFullscreenPreview(
                     )
                 }
                 else -> {
+                    val displayAspect = displayBitmap?.let { bmp ->
+                        bmp.width.toFloat() / bmp.height.toFloat()
+                    }
                     val layoutAspect = openAspectFromBitmap
                         ?: thumbLayoutAspect
                         ?: layoutAspectHint
@@ -260,7 +309,7 @@ fun ImageFullscreenPreview(
                     val layoutContentHeight = if (layoutAspect != null) {
                         containerWidth / layoutAspect
                     } else {
-                        contentHeightAtScale1
+                        containerHeight
                     }
                     val initial = remember(
                         animationBounds, containerWidth, containerHeight, layoutContentHeight,
@@ -635,22 +684,26 @@ fun ImageFullscreenPreview(
                                 .then(sharedElementModifier)
                                 .offset { IntOffset(offsetXAnim.value.roundToInt(), offsetYAnim.value.roundToInt()) }
                         ) {
-                            FullscreenBitmapImage(
-                                bitmap = displayBitmap,
-                                contentDescription = file.name,
-                                modifier = Modifier
-                                    .fillMaxSize()
-                                    .graphicsLayer {
-                                        scaleX = scaleAnim.value
-                                        scaleY = scaleAnim.value
-                                        translationX = offsetXAnim.value - offsetXAnim.value.roundToInt()
-                                        translationY = offsetYAnim.value - offsetYAnim.value.roundToInt()
-                                        val scale = maxOf(scaleAnim.value, 0.01f)
-                                        shape = androidx.compose.foundation.shape.RoundedCornerShape((cornerRadiusAnim.value / scale).dp)
-                                        clip = true
-                                    },
-                                contentScale = ContentScale.Fit
-                            )
+                            displayBitmap?.let { bmp ->
+                                FullscreenBitmapImage(
+                                    bitmap = bmp,
+                                    contentDescription = file.name,
+                                    modifier = Modifier
+                                        .fillMaxSize()
+                                        .graphicsLayer {
+                                            scaleX = scaleAnim.value
+                                            scaleY = scaleAnim.value
+                                            translationX = offsetXAnim.value - offsetXAnim.value.roundToInt()
+                                            translationY = offsetYAnim.value - offsetYAnim.value.roundToInt()
+                                            val scale = maxOf(scaleAnim.value, 0.01f)
+                                            shape = androidx.compose.foundation.shape.RoundedCornerShape(
+                                                (cornerRadiusAnim.value / scale).dp,
+                                            )
+                                            clip = true
+                                        },
+                                    contentScale = ContentScale.Fit,
+                                )
+                            }
                         }
                     }
                 }

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/MessageDissolveEffect.kt

@@ -0,0 +1,17 @@
+package ru.fromchat.ui.chat
+
+import ru.fromchat.api.schema.messages.Message
+
+/** Fade-out duration when deleting/cancelling a message row. */
+internal const val MessageExitFadeMs = 220
+
+/** Layout height collapse while fading (runs in parallel). */
+internal const val MessageExitCollapseMs = 280
+
+internal fun messageExitDurationMs(): Int =
+    maxOf(MessageExitFadeMs, MessageExitCollapseMs) + 80
+
+internal fun messageDissolveKey(message: Message): String {
+    val cid = message.client_message_id?.trim().orEmpty()
+    return if (cid.isNotEmpty()) "c:$cid" else "i:${message.id}"
+}

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/MessageItem.kt

@@ -48,6 +48,7 @@ import androidx.compose.ui.graphics.TransformOrigin
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.LayoutCoordinates
+import androidx.compose.ui.layout.boundsInRoot
 import androidx.compose.ui.layout.layout
 import androidx.compose.ui.layout.onGloballyPositioned
 import androidx.compose.ui.layout.positionInRoot
@@ -59,9 +60,11 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import kotlin.math.roundToInt
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.launch
 import org.jetbrains.compose.resources.stringResource
 import ru.fromchat.Logger
+import ru.fromchat.api.local.AttachmentMediaLog
 import ru.fromchat.Res
 import ru.fromchat.api.local.cache.DecryptedImageCache
 import ru.fromchat.api.local.db.store.ProfileCache
@@ -95,10 +98,13 @@ internal fun isFilenameOnlyMessageCaption(message: Message): Boolean {
 private fun isMessageCorrupted(message: Message): Boolean {
     val files = message.files ?: return false
     return files.withIndex().any { (index, file) ->
-        isImageFilename(file.name) && (
-            message.dmEnvelope == null ||
+        if (!isImageFilename(file.name)) return@any false
+        val isPlainPublic = message.dmEnvelope == null &&
+            (file.path.contains("/normal/") ||
+                (file.nonceB64.isNullOrBlank() && file.wrappedMekB64.isNullOrBlank()))
+        if (isPlainPublic) return@any false
+        message.dmEnvelope == null ||
             message.fileThumbnails?.getOrNull(index)?.isBlank() != false
-        )
     }
 }
 
@@ -154,6 +160,9 @@ fun MessageItem(
     showTimestamp: Boolean = true,
     onBubbleTap: (() -> Unit)? = null,
     enterAnimationRole: EnterAnimationRole = EnterAnimationRole.None,
+    /** When true, fade out and collapse layout space before removal. */
+    isExiting: Boolean = false,
+    onExitAnimationFinished: (() -> Unit)? = null,
 ) {
     val isCorrupted = remember(message.files, message.fileThumbnails, message.dmEnvelope) {
         isMessageCorrupted(message)
@@ -262,7 +271,8 @@ fun MessageItem(
             enterScale.snapTo(0f)
         }
     }
-    val runEnterAnimation = enterStarted && !enterFinished
+    val runEnterAnimation = enterStarted && !enterFinished && !isExiting
+    val shrinkLayoutForEnter = isNewEnterRole && runEnterAnimation
     // Single effect: start the spring as soon as this bubble is marked for enter.
     LaunchedEffect(enterIdentity, runEnterAnimation) {
         if (!runEnterAnimation) return@LaunchedEffect
@@ -285,6 +295,17 @@ fun MessageItem(
             "spring_end identity=${enterIdentity.take(12)} role=${enterAnimationRole.name}",
         )
     }
+    val exitAlpha = remember(enterIdentity) { Animatable(1f) }
+    val layoutCollapse = remember(enterIdentity) { Animatable(1f) }
+    LaunchedEffect(enterIdentity, isExiting) {
+        if (!isExiting) return@LaunchedEffect
+        enterFinished = true
+        coroutineScope {
+            launch { exitAlpha.animateTo(0f, tween(MessageExitFadeMs)) }
+            launch { layoutCollapse.animateTo(0f, tween(MessageExitCollapseMs)) }
+        }
+        onExitAnimationFinished?.invoke()
+    }
     LaunchedEffect(enterIdentity, enterAnimationRole, showSendingIndicator, sendFailed) {
         when (enterAnimationRole) {
             EnterAnimationRole.PreviousLast -> {
@@ -295,7 +316,7 @@ fun MessageItem(
             }
             EnterAnimationRole.NewMessage -> Unit
             else -> {
-                if (!runEnterAnimation && enterScale.value != 1f) {
+                if (!isExiting && !runEnterAnimation && enterScale.value != 1f) {
                     enterScale.snapTo(1f)
                 }
                 timestampForceAlpha.snapTo(1f)
@@ -398,12 +419,15 @@ fun MessageItem(
             modifier = Modifier
                 .fillMaxWidth()
                 .onGloballyPositioned { rowLayoutCoords = it }
+                .graphicsLayer {
+                    alpha = if (isExiting) exitAlpha.value else 1f
+                }
                 .then(rowLongPress)
                 .padding(horizontal = 8.dp)
                 .enterLayoutHeight(
-                    scale = enterScale.value,
+                    scale = if (isExiting) layoutCollapse.value else enterScale.value,
                     minHeightPx = minEnterHeightPx,
-                    active = runEnterAnimation,
+                    active = shrinkLayoutForEnter || isExiting,
                 ),
             horizontalArrangement = if (isAuthor) Arrangement.End else Arrangement.Start,
             verticalAlignment = Alignment.Bottom,
@@ -701,6 +725,37 @@ fun MessageItem(
                                                 (primaryFile != null && !primaryIsImage)
                                             if (showPrimaryImageSlot) {
                                                 val imageKey = imageAttachmentKey(message, 0)
+                                                val layoutAspect = imageAspectRatioForMessage(
+                                                    fileAspectRatios = message.fileAspectRatios,
+                                                    fileDimensions = message.fileDimensions,
+                                                    pendingFileAspectRatio = message.pendingFileAspectRatio,
+                                                    fileAspectRatioPairs = message.fileAspectRatioPairs,
+                                                    fileIndex = 0,
+                                                    confirmed = message.id > 0,
+                                                    hasLocalPreview = !message.pendingFileUri.isNullOrBlank(),
+                                                )
+                                                LaunchedEffect(
+                                                    message.id,
+                                                    message.client_message_id,
+                                                    layoutAspect,
+                                                    message.fileAspectRatioPairs,
+                                                    message.fileDimensions,
+                                                    message.pendingFileAspectRatio,
+                                                    message.pendingFileUri,
+                                                    message.files?.firstOrNull()?.path,
+                                                ) {
+                                                    AttachmentMediaLog.aspect(
+                                                        "tile_state",
+                                                        "msgId" to message.id,
+                                                        "clientId" to message.client_message_id?.take(12),
+                                                        "layoutAspect" to layoutAspect,
+                                                        "pairs" to message.fileAspectRatioPairs?.firstOrNull(),
+                                                        "dims" to message.fileDimensions?.firstOrNull(),
+                                                        "pendingAspect" to message.pendingFileAspectRatio,
+                                                        "pendingUri" to message.pendingFileUri?.take(48),
+                                                        "file" to message.files?.firstOrNull()?.path?.takeLast(32),
+                                                    )
+                                                }
                                                 val awaitingServer =
                                                     message.id < 0 && message.files.isNullOrEmpty()
                                                 val isOutboundPendingImage =
@@ -723,19 +778,7 @@ fun MessageItem(
                                                     fileThumbnail = message.fileThumbnails
                                                         ?.firstOrNull()
                                                         ?.takeIf { it.isNotBlank() },
-                                                    fileAspectRatio = imageAspectRatioForMessage(
-                                                        fileAspectRatios = message.fileAspectRatios,
-                                                        fileDimensions = message.fileDimensions,
-                                                        pendingFileAspectRatio =
-                                                            message.pendingFileAspectRatio,
-                                                        fileIndex = 0,
-                                                        confirmed = message.id > 0,
-                                                        hasLocalPreview =
-                                                            DecryptedImageCache
-                                                                .isDecryptedImageCacheUri(
-                                                                    message.pendingFileUri,
-                                                                ),
-                                                    ),
+                                                    fileAspectRatio = layoutAspect,
                                                     fileSizeBytes =
                                                         message.fileSizes?.firstOrNull(),
                                                     messageId = message.id,
@@ -845,6 +888,7 @@ fun MessageItem(
                                                         fileDimensions = message.fileDimensions,
                                                         pendingFileAspectRatio =
                                                             message.pendingFileAspectRatio,
+                                                        fileAspectRatioPairs = message.fileAspectRatioPairs,
                                                         fileIndex = index,
                                                         confirmed = message.id > 0,
                                                         hasLocalPreview = index == 0 &&

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/components/ChatFileAttachmentTile.kt

@@ -120,6 +120,10 @@ fun ChatFileAttachmentTile(
     val displayUploadProgress = if (isUploading) uploadProgress ?: 0 else uploadProgress
     val openableLocalUri = resolvedCacheUri
         ?: pendingFileUri?.takeIf { isPendingLocal }
+    val canPlainDownload = file != null && dmEnvelope == null &&
+        (file.path.contains("/normal/") || (file.nonceB64.isNullOrBlank() && file.wrappedMekB64.isNullOrBlank()))
+    val canEncryptedDownload = file != null && dmEnvelope != null
+    val canDownload = canPlainDownload || canEncryptedDownload
 
     val onRowClick: (() -> Unit)? = when {
         openableLocalUri != null -> {
@@ -132,7 +136,7 @@ fun ChatFileAttachmentTile(
                 }
             }
         }
-        downloadPaused && file != null && dmEnvelope != null -> {
+        downloadPaused && canDownload -> file?.let { downloadFile ->
             {
                 AttachmentDownloadNotifier.beginDownload(
                     messageId = messageId,
@@ -141,11 +145,11 @@ fun ChatFileAttachmentTile(
                     mirrorAsFileAttachment = true,
                 )
                 scope.launch {
-                    val ok = DmFileDownloader.downloadToCache(
+                    val ok = downloadAttachmentToCache(
                         messageId = messageId,
                         fileIndex = fileIndex,
-                        file = file,
-                        envelope = dmEnvelope,
+                        file = downloadFile,
+                        dmEnvelope = dmEnvelope,
                         currentUserId = currentUserId,
                         clientMessageId = clientMessageId,
                         messageLabel = messageLabel,
@@ -162,7 +166,7 @@ fun ChatFileAttachmentTile(
                 }
             }
         }
-        file != null && dmEnvelope != null && !isDownloading && !downloadPaused -> {
+        canDownload && !isDownloading && !downloadPaused -> file?.let { downloadFile ->
             {
                 AttachmentDownloadNotifier.beginDownload(
                     messageId = messageId,
@@ -171,11 +175,11 @@ fun ChatFileAttachmentTile(
                     mirrorAsFileAttachment = true,
                 )
                 scope.launch {
-                    val ok = DmFileDownloader.downloadToCache(
+                    val ok = downloadAttachmentToCache(
                         messageId = messageId,
                         fileIndex = fileIndex,
-                        file = file,
-                        envelope = dmEnvelope,
+                        file = downloadFile,
+                        dmEnvelope = dmEnvelope,
                         currentUserId = currentUserId,
                         clientMessageId = clientMessageId,
                         messageLabel = messageLabel,
@@ -273,3 +277,33 @@ fun ChatFileAttachmentTile(
         }
     }
 }
+
+private suspend fun downloadAttachmentToCache(
+    messageId: Int,
+    fileIndex: Int,
+    file: DmFile,
+    dmEnvelope: DmEnvelope?,
+    currentUserId: Int?,
+    clientMessageId: String?,
+    messageLabel: String?,
+): Boolean =
+    if (dmEnvelope != null) {
+        DmFileDownloader.downloadToCache(
+            messageId = messageId,
+            fileIndex = fileIndex,
+            file = file,
+            envelope = dmEnvelope,
+            currentUserId = currentUserId,
+            clientMessageId = clientMessageId,
+            messageLabel = messageLabel,
+        )
+    } else {
+        DecryptedFileCache.getOrDownloadPlain(
+            messageId = messageId,
+            fileIndex = fileIndex,
+            file = file,
+            clientMessageId = clientMessageId,
+            messageLabel = messageLabel,
+        ) != null
+    }
+

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/panels/dm/DmPanel.kt

@@ -588,8 +588,9 @@ class DmPanel(
             cancelQueuedMessage(queued)
             return
         }
-        val clientId = _state.messages.find { it.id == messageId }?.client_message_id
-        deleteMessageImmediately(messageId)
+        val message = _state.messages.find { it.id == messageId } ?: return
+        val clientId = message.client_message_id
+        beginMessageDissolve(message)
         DownloadedFileRegistry.invalidateForMessage(messageId)
         DecryptedImageCache.invalidateForMessage(messageId)
         DecryptedFileCache.invalidateForMessage(messageId)

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/panels/publicchat/PublicChatPanel.kt

@@ -18,10 +18,13 @@ import ru.fromchat.api.local.db.store.MessageRepository
 import ru.fromchat.api.local.messages.GENERAL_PUBLIC_GROUP_ID
 import ru.fromchat.api.local.messages.conversationIdForGroup
 import ru.fromchat.api.local.messages.sortMessagesForChatDisplay
+import ru.fromchat.api.local.download.AttachmentDownloadNotifier
+import ru.fromchat.api.local.download.AttachmentDownloadProgress
 import ru.fromchat.api.local.send.OutgoingMessageCoordinator
 import ru.fromchat.api.schema.chats.publicchat.PublicChatProfile
 import ru.fromchat.api.schema.messages.Message
 import ru.fromchat.api.schema.messages.publicchat.SendMessageResponse
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
 import ru.fromchat.api.schema.websocket.WebSocketMessage
 import ru.fromchat.api.schema.websocket.types.MessageDeletedData
 import ru.fromchat.api.schema.websocket.types.ReactionUpdateData
@@ -33,6 +36,7 @@ import ru.fromchat.ui.chat.utils.PublicChatTypingHandler
 import ru.fromchat.ui.chat.utils.TypingHandler
 import ru.fromchat.ui.chat.utils.attachPublicReplyReferences
 import ru.fromchat.ui.chat.utils.mergeDatabaseMessagesWithPanelState
+import ru.fromchat.ui.chat.utils.mergeMessageUiFields
 import ru.fromchat.ui.chat.utils.preserveReplyToFromExisting
 
 class PublicChatPanel(
@@ -76,7 +80,7 @@ class PublicChatPanel(
             val fresh = byId[message.id] ?: return@map message
             ProfileCache.mergePreviewFromPublicMessage(fresh)
             ProfileCache.enrichPublicMessageForDisplay(
-                message.copy(
+                mergeMessageUiFields(fresh, message).copy(
                     username = fresh.username,
                     profile_picture = fresh.profile_picture,
                     verified = fresh.verified,
@@ -93,6 +97,9 @@ class PublicChatPanel(
     override val usesPublicGroupSubtitle: Boolean
         get() = true
 
+    override val supportsAttachments: Boolean
+        get() = true
+
     init {
         val instanceId = CacheContext.activeInstanceId.value.trim()
         if (instanceId.isNotEmpty()) {
@@ -120,6 +127,21 @@ class PublicChatPanel(
                 }
             }
         }
+        scope.launch(Dispatchers.Default) {
+            AttachmentDownloadNotifier.progressFlow.collect { event ->
+                if (event !is AttachmentDownloadProgress.Success || event.messageId <= 0) return@collect
+                val uri = DecryptedImageCache.getUriForStorageKey(event.storageKey) ?: return@collect
+                withContext(Dispatchers.Main.immediate) {
+                    updateMessage(event.messageId) { msg ->
+                        msg.copy(pendingFileUri = uri)
+                    }
+                }
+                MessageCacheStore.patchPublicMessageLocalPreview(
+                    messageId = event.messageId,
+                    localPreviewUri = uri,
+                )
+            }
+        }
         scope.launch {
             typingHandler.typingUsers.collect { users ->
                 Logger.d("PublicChatPanel", "Typing users updated in handler: ${users.map { it.username }}")
@@ -213,18 +235,19 @@ class PublicChatPanel(
      * Match optimistic rows via [Message.client_message_id] from the server ack (never by text).
      */
     private suspend fun confirmIncomingOwnMessageOrAdd(newMsg: Message) {
+        val laidOut = newMsg.resolvePublicAttachmentLayout()
         val uid = currentUserId
-        if (uid != null && newMsg.user_id == uid) {
-            val cid = newMsg.client_message_id?.trim().orEmpty()
+        if (uid != null && laidOut.user_id == uid) {
+            val cid = laidOut.client_message_id?.trim().orEmpty()
             if (cid.isNotEmpty()) {
-                handleMessageConfirmed(cid, newMsg)
+                handleMessageConfirmed(cid, laidOut)
                 return
             }
-            if (newMsg.id > 0 && _state.messages.any { it.id == newMsg.id }) {
+            if (laidOut.id > 0 && _state.messages.any { it.id == laidOut.id }) {
                 return
             }
         }
-        ingestIncomingPublicMessage(newMsg)
+        ingestIncomingPublicMessage(laidOut)
     }
 
     private suspend fun ingestIncomingPublicMessage(newMsg: Message) {
@@ -238,11 +261,20 @@ class PublicChatPanel(
     }
 
     private fun mergeNetworkHistoryWithShown(shown: List<Message>, fromNetwork: List<Message>): List<Message> {
+        val shownById = shown.associateBy { it.id }
         val networkIds = fromNetwork.map { it.id }.toSet()
+        val merged = fromNetwork.map { net ->
+            val local = shownById[net.id]
+            if (local == null) {
+                net.resolvePublicAttachmentLayout()
+            } else {
+                mergeMessageUiFields(net, local)
+            }
+        }
         val ahead = shown.filter { it.id > 0 && it.id !in networkIds }
-        if (ahead.isEmpty()) return fromNetwork
+        if (ahead.isEmpty()) return merged
         return ru.fromchat.api.local.messages.sortMessagesForChatDisplay(
-            ru.fromchat.ui.chat.utils.dedupeMessagesByClientId(fromNetwork + ahead),
+            ru.fromchat.ui.chat.utils.dedupeMessagesByClientId(merged + ahead),
         )
     }
 
@@ -273,7 +305,11 @@ class PublicChatPanel(
 
     override suspend fun onOptimisticMessageConfirmed(clientMessageId: String, confirmed: Message) {
         withContext(Dispatchers.Default) {
-            MessageCacheStore.confirmPublicMessage(clientMessageId, confirmed)
+            MessageCacheStore.confirmPublicMessage(
+                clientMessageId,
+                confirmed.resolvePublicAttachmentLayout(),
+            )
+            OutgoingMessageCoordinator.clearAttachmentOutboxAfterAck(clientMessageId)
         }
     }
 
@@ -296,12 +332,13 @@ class PublicChatPanel(
         val response = responseResult.getOrNull()
 
         if (response != null && response.messages.isNotEmpty()) {
-            ProfileCache.mergePreviewFromPublicMessages(response.messages)
+            val networkMessages = response.messages.map { it.resolvePublicAttachmentLayout() }
+            ProfileCache.mergePreviewFromPublicMessages(networkMessages)
             withContext(Dispatchers.Main) {
                 val shown = _state.messages
-                if (shown.isNotEmpty() && !publicHistoryDiffersForUi(shown, response.messages)) {
+                if (shown.isNotEmpty() && !publicHistoryDiffersForUi(shown, networkMessages)) {
                     Logger.d("PublicChatPanel", "Network history matches UI; skip clear/re-add")
-                    val withSenders = mergePublicSenderFieldsFromNetwork(shown, response.messages)
+                    val withSenders = mergePublicSenderFieldsFromNetwork(shown, networkMessages)
                     if (withSenders != shown) {
                         updateState { it.copy(messages = sortMessagesForChatDisplay(withSenders)) }
                     }
@@ -311,7 +348,7 @@ class PublicChatPanel(
                     batchStateUpdates {
                         val merged = preserveReplyToFromExisting(
                             shown,
-                            mergeNetworkHistoryWithShown(shown, response.messages),
+                            mergeNetworkHistoryWithShown(shown, networkMessages),
                         )
                         clearMessages()
                         addMessages(
@@ -323,7 +360,7 @@ class PublicChatPanel(
                 }
             }
             withContext(Dispatchers.Default) {
-                val mergedForCache = mergeNetworkHistoryWithShown(_state.messages, response.messages)
+                val mergedForCache = mergeNetworkHistoryWithShown(_state.messages, networkMessages)
                 MessageCacheStore.replacePublicMessages(mergedForCache)
             }
         } else if (responseResult.isFailure) {
@@ -369,8 +406,9 @@ class PublicChatPanel(
                 ApiClient.getMessages(limit = 50, beforeId = oldestMessage.id)
             }
             if (response.messages.isNotEmpty()) {
-                ProfileCache.mergePreviewFromPublicMessages(response.messages)
-                val older = ProfileCache.enrichPublicMessagesForDisplay(response.messages.reversed())
+                val olderRaw = response.messages.map { it.resolvePublicAttachmentLayout() }
+                ProfileCache.mergePreviewFromPublicMessages(olderRaw)
+                val older = ProfileCache.enrichPublicMessagesForDisplay(olderRaw.reversed())
                 updateState { currentState ->
                     currentState.copy(
                         messages = older + currentState.messages
@@ -499,9 +537,12 @@ class PublicChatPanel(
     }
 
     override suspend fun handleDeleteMessage(messageId: Int) {
-        deleteMessageImmediately(messageId)
-        clearReplyReferencesTo(messageId)
-
+        val message = _state.messages.find { it.id == messageId } ?: return
+        if (messageId < 0) {
+            cancelQueuedMessage(message)
+            return
+        }
+        beginMessageDissolve(message)
         ApiClient.deleteMessage(messageId)
     }
 

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/utils/AttachmentImageGeometry.kt

@@ -1,18 +1,87 @@
 package ru.fromchat.ui.chat.utils
 
+import androidx.compose.foundation.layout.requiredSize
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
+import ru.fromchat.api.local.cache.DecryptedImageCache
 import ru.fromchat.api.local.db.aspectRatioFromDimensionPair
+import ru.fromchat.api.local.db.isPlaceholderAttachmentAspectRatio
+import ru.fromchat.api.local.db.isPlaceholderAttachmentDimensions
 import ru.fromchat.api.local.download.ChatPreviewDecodeSize
+import ru.fromchat.api.local.download.LocalDecodedImageCache
 import ru.fromchat.ui.chat.MessageGroupInfo
 import ru.fromchat.ui.chat.bubbleTopRadii
 
+/** Max attachment preview width in chat bubbles (160dp × 1.3). */
+internal val ATTACHMENT_TILE_MAX_WIDTH = 208.dp
+
+/** Max attachment preview height (240dp × 1.3). */
+internal val ATTACHMENT_TILE_MAX_HEIGHT = 312.dp
+
+/** Keeps wide panoramas tall enough for upload/download chrome (80dp × 1.3). */
+internal val ATTACHMENT_TILE_MIN_SHORT_EDGE = 104.dp
+
 /** Padding between bubble edge and attachment image (must match MessageItem image padding). */
 internal val ATTACHMENT_IMAGE_INSET = 2.dp
 
 /** Slight rounding on image preview bottom corners (less than bubble). */
 private val IMAGE_BOTTOM_CORNER = 4.dp
 
+/**
+ * Fixed dp tile size from max bounds + aspect ratio.
+ *
+ * Uses [requiredSize] so [androidx.compose.foundation.layout.IntrinsicSize.Max] bubbles do not
+ * adopt the child Image's intrinsic width (tiny ~80px disk/server thumbs → ~3× too small on
+ * xxhdpi vs [maxWidth] in dp).
+ */
+internal fun computeAttachmentTileSize(
+    aspectRatio: Float,
+    maxWidth: Dp = ATTACHMENT_TILE_MAX_WIDTH,
+    maxHeight: Dp = ATTACHMENT_TILE_MAX_HEIGHT,
+    minShortEdge: Dp = ATTACHMENT_TILE_MIN_SHORT_EDGE,
+): Pair<Dp, Dp> {
+    var width = maxWidth
+    var height = maxWidth / aspectRatio
+    if (height > maxHeight) {
+        height = maxHeight
+        width = maxHeight * aspectRatio
+    }
+    val shortEdge = minOf(width, height)
+    if (shortEdge < minShortEdge) {
+        val scale = minShortEdge / shortEdge
+        width *= scale
+        height *= scale
+        if (width > maxWidth) {
+            val shrink = maxWidth / width
+            width = maxWidth
+            height *= shrink
+        }
+        if (height > maxHeight) {
+            val shrink = maxHeight / height
+            height = maxHeight
+            width *= shrink
+        }
+    }
+    return width to height
+}
+
+@Composable
+internal fun Modifier.attachmentTileLayout(
+    aspectRatio: Float?,
+    maxWidth: Dp = ATTACHMENT_TILE_MAX_WIDTH,
+    maxHeight: Dp = ATTACHMENT_TILE_MAX_HEIGHT,
+): Modifier {
+    val ratio = aspectRatio?.takeIf { it.isFinite() && it > 0f } ?: 1f
+    val (width, height) = remember(ratio, maxWidth, maxHeight) {
+        computeAttachmentTileSize(ratio, maxWidth, maxHeight)
+    }
+    return this.requiredSize(width, height)
+}
+
 /** Inner clip: top corners follow bubble minus inset; bottom corners lightly rounded. */
 internal fun attachmentImageCornerShape(
     isAuthor: Boolean,
@@ -31,22 +100,62 @@ internal fun attachmentImageCornerShape(
     )
 }
 
-/** Width / height for layout and decode. Pixel dimensions and server ratios beat stale pending. */
+/** Decode-cache keys for a message attachment (client-id seed + confirmed message id). */
+internal fun attachmentDecodeCacheKeys(
+    messageId: Int,
+    fileIndex: Int,
+    clientMessageId: String?,
+): List<String> {
+    val keys = ArrayList<String>(2)
+    clientMessageId?.trim()?.takeIf { it.isNotEmpty() }?.let { cid ->
+        keys.add(DecryptedImageCache.storageKey(-1, fileIndex, cid))
+    }
+    if (messageId > 0) {
+        val idKey = DecryptedImageCache.storageKey(messageId, fileIndex, null)
+        if (idKey !in keys) keys.add(idKey)
+    }
+    if (keys.isEmpty()) {
+        keys.add(DecryptedImageCache.storageKey(messageId, fileIndex, clientMessageId))
+    }
+    return keys
+}
+
+internal fun peekDecodedAttachmentBitmap(cacheKeys: List<String>) =
+    cacheKeys.firstNotNullOfOrNull { LocalDecodedImageCache.peekFull(it) }
+
+/**
+ * Width / height for layout and decode.
+ * When a local preview exists, keep the outbound aspect if the server only sent the [1,1] placeholder.
+ */
 internal fun imageAspectRatioForMessage(
     fileAspectRatios: List<Float>?,
     fileDimensions: List<Pair<Int, Int>>?,
     pendingFileAspectRatio: Float?,
+    fileAspectRatioPairs: List<List<Int>>? = null,
     fileIndex: Int = 0,
     @Suppress("UNUSED_PARAMETER") confirmed: Boolean = true,
     @Suppress("UNUSED_PARAMETER") hasLocalPreview: Boolean = false,
 ): Float? {
-    fileDimensions?.getOrNull(fileIndex)?.let { (w, h) ->
-        if (w > 0 && h > 0) {
+    val localRatio = pendingFileAspectRatio?.takeIf { fileIndex == 0 && it > 0f }
+    val pair = fileAspectRatioPairs?.getOrNull(fileIndex)
+    val pairRatio = pair?.takeIf { it.size >= 2 }?.let { (w, h) ->
+        if (w > 0 && h > 0 && !isPlaceholderAttachmentDimensions(w, h)) {
+            aspectRatioFromDimensionPair(w, h)
+        } else {
+            null
+        }
+    }
+    val serverDim = fileDimensions?.getOrNull(fileIndex)
+    val serverRatio = fileAspectRatios?.getOrNull(fileIndex)?.takeIf { it > 0f }
+
+    pairRatio?.let { return it }
+    serverDim?.let { (w, h) ->
+        if (w > 0 && h > 0 && !isPlaceholderAttachmentDimensions(w, h)) {
             return aspectRatioFromDimensionPair(w, h)
         }
     }
-    fileAspectRatios?.getOrNull(fileIndex)?.takeIf { it > 0f }?.let { return it }
-    return pendingFileAspectRatio?.takeIf { fileIndex == 0 && it > 0f }
+    serverRatio?.takeIf { !isPlaceholderAttachmentAspectRatio(it) }?.let { return it }
+    return localRatio
 }
 
 internal fun coalesceDecodeTarget(vararg sizes: ChatPreviewDecodeSize?): ChatPreviewDecodeSize {

app/shared/src/commonMain/kotlin/ru/fromchat/ui/chat/utils/MessageUiMerge.kt

@@ -3,9 +3,11 @@ package ru.fromchat.ui.chat.utils
 import ru.fromchat.api.ApiClient
 import ru.fromchat.api.local.cache.DecryptedImageCache
 import ru.fromchat.api.local.db.aspectRatioFromDimensionPair
+import ru.fromchat.api.local.db.isPlaceholderAttachmentDimensions
 import ru.fromchat.api.local.messages.sortMessagesForChatDisplay
 import ru.fromchat.api.schema.messages.Message
 import ru.fromchat.api.schema.messages.dm.DmEnvelope
+import ru.fromchat.api.schema.messages.publicchat.resolvePublicAttachmentLayout
 
 internal fun resolveDmReplyToId(
     envelope: DmEnvelope?,
@@ -80,37 +82,82 @@ internal fun mergeDatabaseMessagesWithPanelState(
 }
 
 internal fun mergeMessageUiFields(db: Message, panel: Message?): Message {
-    if (panel == null) return db
+    if (panel == null) {
+        return if (!db.files.isNullOrEmpty() && db.dmEnvelope == null) {
+            db.resolvePublicAttachmentLayout()
+        } else {
+            db
+        }
+    }
     val confirmed = db.id > 0
+    val dbHasRealLayout = db.fileAspectRatioPairs?.firstOrNull()?.let { pair ->
+        pair.size >= 2 && !isPlaceholderAttachmentDimensions(pair[0], pair[1])
+    } == true || db.fileDimensions?.firstOrNull()?.let { (w, h) ->
+        !isPlaceholderAttachmentDimensions(w, h)
+    } == true
+    // Keep any local preview across confirm so own image sends never flash network error UI.
     val localPreview = db.pendingFileUri?.takeIf { DecryptedImageCache.isDecryptedImageCacheUri(it) }
         ?: panel.pendingFileUri?.takeIf { DecryptedImageCache.isDecryptedImageCacheUri(it) }
-    return db.copy(
+        ?: panel.pendingFileUri?.takeIf { it.isNotBlank() }
+        ?: db.pendingFileUri?.takeIf { it.isNotBlank() }
+    val serverDim = db.fileDimensions?.firstOrNull()
+        ?: db.fileAspectRatioPairs?.firstOrNull()?.takeIf { it.size >= 2 }?.let { (w, h) -> w to h }
+        ?: panel.fileDimensions?.firstOrNull()
+        ?: panel.fileAspectRatioPairs?.firstOrNull()?.takeIf { it.size >= 2 }?.let { (w, h) -> w to h }
+    val serverRatio = db.fileAspectRatios?.firstOrNull() ?: panel.fileAspectRatios?.firstOrNull()
+    val localAspect = panel.pendingFileAspectRatio?.takeIf { it > 0f }
+        ?: db.pendingFileAspectRatio?.takeIf { it > 0f }
+        ?: panel.fileDimensions?.firstOrNull()?.let { (w, h) -> aspectRatioFromDimensionPair(w, h) }
+        ?: db.fileDimensions?.firstOrNull()?.let { (w, h) -> aspectRatioFromDimensionPair(w, h) }
+    val merged = db.copy(
         pendingFileUri = when {
-            confirmed -> localPreview ?: db.pendingFileUri
+            confirmed -> localPreview
             else -> panel.pendingFileUri ?: db.pendingFileUri
         },
         pendingFilename = if (confirmed) null else panel.pendingFilename ?: db.pendingFilename,
         uploadJobId = if (confirmed) null else panel.uploadJobId ?: db.uploadJobId,
-        pendingFileAspectRatio = if (confirmed) {
-            db.fileDimensions?.firstOrNull()?.let { (w, h) -> aspectRatioFromDimensionPair(w, h) }
-                ?: db.fileAspectRatios?.firstOrNull()
+        pendingFileAspectRatio = when {
+            confirmed && dbHasRealLayout -> null
+            confirmed -> localAspect
+                ?: serverDim?.let { (w, h) -> aspectRatioFromDimensionPair(w, h) }
+                ?: serverRatio
                 ?: db.pendingFileAspectRatio
-        } else {
-            panel.pendingFileAspectRatio ?: db.pendingFileAspectRatio
+            else -> panel.pendingFileAspectRatio ?: db.pendingFileAspectRatio
         },
         uploadProgress = if (confirmed) null else panel.uploadProgress ?: db.uploadProgress,
         uploadError = if (confirmed) null else panel.uploadError ?: db.uploadError,
         files = db.files ?: panel.files,
         dmEnvelope = db.dmEnvelope ?: panel.dmEnvelope,
         fileThumbnails = db.fileThumbnails ?: panel.fileThumbnails,
-        fileAspectRatios = db.fileAspectRatios ?: panel.fileAspectRatios,
+        fileAspectRatioPairs = db.fileAspectRatioPairs ?: panel.fileAspectRatioPairs,
+        fileAspectRatios = when {
+            confirmed && dbHasRealLayout -> db.fileAspectRatios ?: panel.fileAspectRatios
+            confirmed && localAspect != null -> listOf(localAspect)
+            else -> db.fileAspectRatios ?: panel.fileAspectRatios
+        },
         fileSizes = db.fileSizes ?: panel.fileSizes,
-        fileDimensions = db.fileDimensions ?: panel.fileDimensions,
+        fileDimensions = when {
+            confirmed && dbHasRealLayout -> db.fileDimensions ?: panel.fileDimensions
+            confirmed && panel.fileDimensions?.any { (w, h) ->
+                !isPlaceholderAttachmentDimensions(w, h)
+            } == true && !dbHasRealLayout -> panel.fileDimensions
+            confirmed && db.fileDimensions?.any { (w, h) ->
+                !isPlaceholderAttachmentDimensions(w, h)
+            } == true -> db.fileDimensions
+            else -> db.fileDimensions ?: panel.fileDimensions
+        },
         content = db.content.ifBlank { panel.content },
         isContentCorrupted = panel.isContentCorrupted || db.isContentCorrupted,
         replyToId = db.replyToId ?: panel.replyToId,
         reply_to = db.reply_to ?: panel.reply_to,
+        client_message_id = panel.client_message_id?.trim()?.takeIf { it.isNotEmpty() }
+            ?: db.client_message_id,
     )
+    return if (!merged.files.isNullOrEmpty() && merged.dmEnvelope == null) {
+        merged.resolvePublicAttachmentLayout()
+    } else {
+        merged
+    }
 }
 
 /** Keeps hydrated [Message.reply_to] when a network/DB refresh omits nested reply payloads. */

app/shared/src/iosMain/kotlin/ru/fromchat/api/local/cache/AttachmentDiskThumbnail.ios.kt

@@ -0,0 +1,42 @@
+@file:OptIn(ExperimentalForeignApi::class, BetaInteropApi::class)
+
+package ru.fromchat.api.local.cache
+
+import kotlinx.cinterop.BetaInteropApi
+import kotlinx.cinterop.ExperimentalForeignApi
+import kotlinx.cinterop.useContents
+import platform.CoreGraphics.CGRectMake
+import platform.Foundation.NSData
+import platform.Foundation.create
+import platform.Foundation.writeToFile
+import platform.UIKit.UIGraphicsBeginImageContextWithOptions
+import platform.UIKit.UIGraphicsEndImageContext
+import platform.UIKit.UIGraphicsGetImageFromCurrentImageContext
+import platform.UIKit.UIImage
+import platform.UIKit.UIImageJPEGRepresentation
+
+actual fun generateAttachmentDiskThumbnail(
+    sourceAbsolutePath: String,
+    destAbsolutePath: String,
+    maxEdgePx: Int,
+): Boolean {
+    val data = NSData.create(contentsOfFile = sourceAbsolutePath) ?: return false
+    val image = UIImage.imageWithData(data) ?: return false
+    val width = image.size.useContents { width }
+    val height = image.size.useContents { height }
+    if (width <= 0.0 || height <= 0.0) return false
+    val longEdge = maxOf(width, height)
+    val scale = if (longEdge > maxEdgePx) maxEdgePx.toDouble() / longEdge else 1.0
+    val dstW = (width * scale).coerceAtLeast(1.0)
+    val dstH = (height * scale).coerceAtLeast(1.0)
+    UIGraphicsBeginImageContextWithOptions(
+        platform.CoreGraphics.CGSizeMake(dstW, dstH),
+        false,
+        1.0,
+    )
+    image.drawInRect(CGRectMake(0.0, 0.0, dstW, dstH))
+    val scaled = UIGraphicsGetImageFromCurrentImageContext()
+    UIGraphicsEndImageContext()
+    val jpeg = scaled?.let { UIImageJPEGRepresentation(it, 0.85) } ?: return false
+    return jpeg.writeToFile(destAbsolutePath, atomically = true)
+}

app/shared/src/iosMain/kotlin/ru/fromchat/api/local/download/LocalImageFileDimensions.ios.kt

@@ -0,0 +1,3 @@
+package ru.fromchat.api.local.download
+
+internal actual fun readLocalImageDimensions(absolutePath: String): Pair<Int, Int>? = null