fix retry sending attachments that are not downloaded

Session/Conversations/ConversationVC+Interaction.swift

@@ -1611,7 +1611,19 @@ extension ConversationVC:
                 quotedAttachment.downloadUrl == Attachment.nonMediaQuoteFileId,
                 let quotedInteraction = try? quote.originalInteraction.fetchOne(db)
             {
-                let attachment = try? quotedInteraction.attachments.fetchAll(db).first
+                let attachment: Attachment? = {
+                    if let attachment = try? quotedInteraction.attachments.fetchAll(db).first {
+                        return attachment
+                    }
+                    if
+                        let linkPreview = try? quotedInteraction.linkPreview.fetchOne(db),
+                        let linkPreviewAttachment = try? linkPreview.attachment.fetchOne(db)
+                    {
+                        return linkPreviewAttachment
+                    }
+                       
+                    return nil
+                }()
                 try quote.with(
                     attachmentId: attachment?.cloneAsQuoteThumbnail()?.inserted(db).id
                 ).update(db)

SessionMessagingKit/Database/Models/Attachment.swift

@@ -883,9 +883,10 @@ extension Attachment {
         let cloneId: String = UUID().uuidString
         let thumbnailName: String = "quoted-thumbnail-\(sourceFilename ?? "null")"
         
+        guard self.isVisualMedia else { return nil }
+        
         guard
             self.isValid,
-            self.isVisualMedia,
             let thumbnailPath: String = Attachment.originalFilePath(
                 id: cloneId,
                 mimeType: OWSMimeTypeImageJpeg,