jobs and expert attachments issue

Hi,

In Job and experts plugin when an expert applies to a job and wants to attach his file, upload directory opens, this shows all files in uploads from the other users as well from admin side.
how can we assign expert to have his own files and he cannot see what's there in uploads other files. have tried using restrict of membership but without any luck through restrict i could only block menu and pages.
Regards
Irfan