We found a problem that a deleted attachment re-appears after clicking "Post Reply" button under User Portal. The procedure is detailed as follows.1. Under the User Portal, open an existing ticket.2. Attach the 1st file and click "Post Reply" button.3. Delete the attachment by clicking the TRASH icon.4. Attach the 2nd file and click "Post Reply" button.5. Look at the latest thread of the ticket. The deleted 1st file is shown together with the 2nd file.Server Configuration==========================================osTicket Version          v1.9.4 (c18eac4)Web Server Software   Apache/2.4.10 (Win32) PHP/5.5.14MySQL Version           5.6.19PHP Version               5.5.14