Bear with me while I explain the whole situation. Have an iPhone 12. Have added a bunch of music to it, about 31G or so. Took a long while to curate that list because I was on a 2009 Mac Pro/High Sierra (couldn’t go higher due to a GTX980 in there). I actually had to go into winblowz and use iTunes there too even add the songs.
It complains about upgrading to 18.x because not enough free disk space (says I have about 7G free, read it has to be something around 10G). Then I discover that phone has a non working RFD chip in it. Got a replacement. Figure this time I better use a playlist and do a sync to add or remove songs.
Trying to manually create the okaylist is a horrendous prospect, a big art of the issue is they sort stuff just a little bit differently. So now I am on 15.2. Seems I can NOT add a song on the phone to a playlist. Lame. Or maybe I’m not understanding how things work.
Soooo, how can I create a playlist from the songs already on the phone? Keep in mind I have access to Music in Sequoia and iTunes in win10.