I've been having some issues with the Music App not adding songs to my Library, too. I've got iTunes Match and Apple Music w/ Family Sharing, and when I add tracks I've bought on Bandcamp they're usually matched. I've been seeing nearly all tracks just get uploaded now. Which sucks because that takes away from my iCloud Storage while the Matched Tracks do not. And then same with adding songs in Apple Music to my Library, it stays on the Plus icon until a restart the Music App. Seems like any changes I make in the Music app aren't reflected now until I restart the app.
::EDIT::
I’ve got an album I’m trying to have the Music App recognize and match, and it keeps uploading instead, and a few are actually showing a cloud symbol with an ! Error. The tracks still play fine from my USB stick in my car, though. I can play ‘em in the Music app just fine, too. Do I really need to wait for an entire operating system uodate?
PSS: none of my music library changes are being reflected on my iPhone or iPad but are still reflected on the web. Even the uploaded tracks that should have been matched. Adding songs to a playlist in the Music app are then reflected on the web right away, but still not on my iDevices.