Hmm, as an experiment go to your WIN10 computer and enter \\192.168.0.xxx into a browser window.
That should take you into QNAP’s software.
Once there do as @wklie suggested up above -
You should see something like this -
Lets see what the results of that are.
Also, once in the QNAP, a screen print of the actual folder names for your music might help.