Music imported from CD is not syncing to my iPhone
I am having a nightmare. So in trying to fix the old album artwork not matching correctly on iPhone I followed the steps to delete all the music from my iPhone (iOS 16.6.1) and then resync to my MacBook Cataline 10.15.7) to update it. However since doing this it will not sync all of the music that I uploaded into Music (used to be call iTunes) from CDs. So now instead of having some mismatched album artwork I am now missing 2/3 of all my music from my iPhone.
I have tried everything without success, including the post on erratic syncing which doesn't address this issue at all. So quite simply how do I sync ALL the music currently on my MacBook to my iPhone and not just the music purchased from the iTunes store?
Sync Library is turned off, which as I understand it should enable me to sync non-iTune purchased music, but it's not working.
MacBook Pro 13″, macOS 10.15