Upload file filter in [windows] desktop client

Ability to add filter to prevent uploading eg. *.mp3 files

Those functions exist server side. Via file access control, you can prevent certain mimetypes or endings … did you try that?

ehh… I need it in client, so CLIENT could edit filter in the way he need.

In this case you can edit the “ignored files” list. But thats up to each user/client then …