diff --git a/ConversationsClassic/AppCore/Middlewares/FileMiddleware.swift b/ConversationsClassic/AppCore/Middlewares/FileMiddleware.swift
index 6008dd2..9b25e36 100644
--- a/ConversationsClassic/AppCore/Middlewares/FileMiddleware.swift
+++ b/ConversationsClassic/AppCore/Middlewares/FileMiddleware.swift
@@ -30,21 +30,19 @@ final class FileMiddleware {
 
                 // for outgoing messages with shared attachments
                 for message in messages where message.attachmentLocalPath != nil && message.attachmentRemotePath == nil && message.pending {
-                    if wSelf.downloadingMessageIDs.contains(message.id) {
-                        continue
-                    }
-                    wSelf.downloadingMessageIDs.insert(message.id)
                     DispatchQueue.main.async {
                         store.dispatch(.xmppAction(.xmppSharingTryUpload(message)))
                     }
                 }
 
                 // for outgoing messages with shared attachments which are already uploaded
-                // but have no thumbnail
-                for message in messages where message.attachmentLocalName != nil && message.attachmentRemotePath != nil && message.attachmentThumbnailName == nil && !message.pending && !message.sentError {
-                    DispatchQueue.main.async {
-                        // swiftlint:disable:next force_unwrapping
-                        store.dispatch(.fileAction(.createAttachmentThumbnail(messageId: message.id, localName: message.attachmentLocalName!)))
+                // but have no thumbnail (only for images)
+                for message in messages where !message.pending && !message.sentError && message.attachmentType == .image {
+                    if message.attachmentLocalName != nil && message.attachmentRemotePath != nil && message.attachmentThumbnailName == nil {
+                        DispatchQueue.main.async {
+                            // swiftlint:disable:next force_unwrapping
+                            store.dispatch(.fileAction(.createAttachmentThumbnail(messageId: message.id, localName: message.attachmentLocalName!)))
+                        }
                     }
                 }