Tracks have not been updated, probably due to a write permission issue

I get this when trying to save tags (star rating). What does this mean and how do I go about fixing it?
Thanks
Paul

Hello @Champster, where does your file is located?

Damien, I’m so sorry. I’m not used to such an elegant application, and my question, embarrassingly so, was when I was using Tidal. It works great for my songs in Library. Sorry to bother you. My bad.