Hi @arthur_Zaretsky ---- Thank you for the continued feedback here bt more importantly, thank you for your patience.
I noticed that you had raised the same issue in this thread here as well. Just to keep you in the loop, I would normally combine the two threads but I don’t want to re-add any any information that has already be stated above. As such, I will be addressing your support request “here” as I can see you have been getting help from other users (thank you everyone 
)
Continuing forward, as asked previously, would kindly provide a screenshot of your “storage” tab in Roon so we can see if your “music” folder is appearing. Additionally, can you please verify that you can access the internal storage of your NUC via the OS on another device as can be seen in my screenshots below:
-Eric