@mikolajek: basically you’re trying to tag files on an UNC (that is, a path like \\fileserver\folder\ ).
Tabbles doesn’t support that: in order to tag those files, you need to map your NAS to a letter (I assume you know how to do that).

In our next release, we’ll manage this exception, meaning that instead of crashing, Tabbles will show an error message. But if you map your drive, you’re good to go already.

BR,

A.