I infer from your comment about “refreshing MinimServer” that you know how to do a rescan using MinimWatch. (I mention this only to cover all possible bases.)
You mentioned new files. Did you by any chance create a new folder but not tell MinimServer to look in that folder? Or not give it appropriate permissions on the NAS? (The latter did happen to me once.)
Yes to the first two. minimwatch/server are the same thing. you can reload/ refresh etc…using a rightclick. This usually worked fine, but not for a while now.
Whats the NAS permissions thing ? Just uploaded stuff as per all other files.