fix kafka attachment message id binding

server/kafka_file_lifecycle.go

@@ -128,7 +128,14 @@ func executeKafkaFileAttachmentsBind(tenantID types.TenantID, payload kafkaFileL
 		return types.ErrMalformed
 	}
 	if types.GetTopicCat(payload.Topic) != types.TopicCatGrp {
-		return store.Files.LinkAttachments(tenantID, "", msgID, payload.AttachmentURLs)
+		// Kafka persistence writes the decoded UID as the SQL message primary key,
+		// while the lifecycle payload carries the externally encoded UID. The
+		// file-link adapter expects the raw SQL ID, so decode it before binding.
+		databaseMsgID := types.Uid(store.DecodeUid(msgID))
+		if databaseMsgID.IsZero() {
+			return types.ErrMalformed
+		}
+		return store.Files.LinkAttachments(tenantID, "", databaseMsgID, payload.AttachmentURLs)
 	}
 	uploader := types.ParseUserId(payload.UserID)
 	if uploader.IsZero() {