This is getting ridiculous now - I thought after downloading 15.1.1 update for iPhone it may have solved it but still after trying to sync my iPhone 13 with iTunes via cable it seems to not recognise what is already on there and syncs my whole 20,000 iTunes songs.
When I attach the cable and I go to the music tabs it shows Sync Music to iPhone Pro 13 unticked which is strange because this has always been ticked previously. It's as if iTunes is automatically taking it out and then my iPhone is thinking I need to re-sync my whole library. Never seen this before.

Does anyone know where the iPhone picks up the information from when it syncs with iTunes?
I keep all music organised by iTunes in the media folder shown below - may my iPhone is picking up the information from somewhere else? Is there anywhere I can check?
My Mac Book is just not recognising what is already on my iPhone and I just cannot see any solution at the moment
