Drag and drop music not working
I have an mp3 that I would like to get into the music app on my iPhone. I updated iOS and then also updated the OS on my Mac. When I try to drag the song from Music on my Mac to my phone, nothing happens - no green plus, no error, nothing. My husband tried the same thing with his phone and his Mac and it works perfectly (same iOS, same Mac OS). I even tried plugging my phone into his computer, still no luck. What could possibly be the problem?
iPhone 12