"List of attachments per user" broken after moving server

First of all. Congratulations on developing this system. I've been using it for a few years now. To improve user performance I moved ProjeQtOr to a new server.

I performed the mysql backup and restore procedures and everything worked perfectly, except for the attachments.

I copied the "files" directory from the old server to the new server and ensured the access permissions were correct.

I analyzed the log and there is something with separator.



My knowledge of PHP is almost nil. I would like to be able to solve this problem and at the same time contribute to the improvement of ProjeQtOr. What can I do ?