من هم همین مشکل رو داشتم از پشتیبانی دایرکت ادمین پرسیدم جواب زیر رو داد.
I moved your script out of the way, as it wasn't working.. (custom/ftp_upload.php)
I tested an upload of the behnam Admin account, and the file did show up, but was size 0 on the remote end.
That also seems like the disk is full? or perhaps there are some quotas on the u1347 account, I'm not sure.

در نهایت فهمیدم فضای پشتیبان که FTP میکنم پر شده است