Thanks for the reply! The files are on a SD card in a top level folder called music, and I'm able to grant access via the Music folders screen. All Music is the only place I see any content and if I long press a track it will allow me to see info/tags. This morning the app seems to be in a constant loop of scanning, and selecting any category is very sluggish. I have previously been able to play tracks, but possibly due to this constant scanning it doesn't seem to want to today so I can't test if I can see info/tags whilst playing at the moment. I have elected to try another reinstall to see if I can get out of this loop.
There is a great deal of music on the SD card (30,000+) but if I use the android File app I can access and see all the files in a timely fashion
Currently the scanning messages have gone from "Folders 0, Playlists 0, Songs 0" to (after maybe 15 minutes) starting to count the amount of Folders / files - only getting so far then going back to "Folders 0..."etc. Even so I can see music in ALL Music even though I cleared the app data on the reinstall. I have restarted another full scan which is currently showing "Folders 0..." again