iPhone music library won't sync to Mac

Thanks for the response. I checked out both articles. I'm not getting an error message. All iOs are updated (thats what caused the problem.) All iCloud links are unchecked, and all of the music I want to sync shows up in the list in finder. 99% of the music was already on my phone when I started and now it just wont play. There are only 10 new songs I wanted to import, and now nothing on the phone works except itunes purchased music.

Yes. I see music and I have played music from it. My music is all in there. It did integrate all my itunes including playlists. I have gone thru the sync settings. My music still shows in the itunes folder, and it shows in the list of things I can sync to my phone in the finder window. It just won't actually do it. I have checked for it to sync my entire music library, and it goes thru the motions but when its done, nothing is changed on the phone.

No error messages. Phone unlocked. My last restore point is from 2017. There has to be some setting that I'm missing somewhere. Everything was fine until I did the sync after updating to Catalina.

I guess that going to be my only option. Thanks for all the help!

When I uncheck the sync entire library option, I can scroll thru the list of items to check to sync individually. I assume that those are the music files on the computer and their presence in that list indicates they are available to sync. I'm fairly computer literate, but at this point I'm willing to concede any number of operator errors. All the music is present in the Music app, and all the music is present in that list with check boxes when I uncheck sync all music. I've tried just checking a few select items but nothing happens. It goes thru the motions but doesn't change anything on the phone.