If you upload a file via the backend and later delete that file, the following happens as far as I understood :
The entry in the mysql table is deleted, or better said : The flag for deleted is set.
The biggest problem :
All deleted files get new file permission, as soon as you delete them from the "Trash Folder" in the backend, instead of really being deleted from the server.
That would not be a problem, if this filepermission wouldn't be 660
This means, that even the owner of such a file is not able to delete it via ftp
I had to phone with my Provider and he had to delete those files manually by using Server-Admin rights.
@Oliver :
Could you please modify those routines in a way, that files, I delete in the backend are physically deleted from server ?
THis would help to safe place on a domain and create less phone calls to server admins