I linked the file to Clementine and it had no problems adding the folder as my library.
I don’t think I am being ransomware, because I have access to the Qnap and can see the files / modify them.
Also a clean install of Roon should have fixed it. But I still don’t get any albums or anything. Removing folder / adding / forcing rescan does nothing.
And the user/password combination Roon is using to access the QNAP appliance is certainly correct? Is that user marked active and not locked in that NAS?
It’s is very unlikely that Roon just stops recognizing it’s library. So where there any changes around that time when Roon changed its behavior like for example:
Updates to the OS (QTS?) your Core runs on?
To the way (update) Roon Server is installed/running (QNAP package/Docker image/ other?) on that Core?
Where there possibly updates to other Apps installed on the NAS?
Did you activate/install other/new Apps/services on your NAS?
Did you change a configuration setting maybe (OS/App/service)?
You can try and restore a recent backup, I hope you have one, but without knowing what might have caused the issue, there is no way to know if this might help/fix anything for you.
Without any details at hand, this thread might also cover what’s happening to your installation (just a shot in the blue):