iPhone and iMac, both mine, somehow different music libraries
I have had many devices over the years. Somehow, my iMac and my iPhone have different music libraries. I can consolidate purchased music, and share those between the libraries just fine.
The problem is, I have some songs on my iPhone that are my own. iTunes ignores these, no matter what I try.
I want to merge both libraries, and have all songs on both devices. Both libraries are connected to my own Apple profile.
What can I do?
Thanks,
Robert
iPhone 6, iOS 12