Adding a copied music file in my account (also family share) to a different iPhone
My husband didn't sync his music to the cloud when he upgraded to an iPhone 11. Don't know if this makes a difference, but he's part of my Family Share. I went into the local Apple Store and was shown how to make a copy of my music library and name it as my husband's file. But I'm not sure how to add the file to his music library on his phone and Apple ID. I believe I need to plug in his iPhone to my computer (where the file exists) but do I then sign out of my ID and sign in with his? I don't want to screw this up! It would be very time consuming if I had to add music by individually loading the CD in my CD reading device!
Thanks!