To play local files with Apple Music on your phone, you need to subscribe to Apple Music. Then you can sync the library from the computer to your phone.How to Add a Song to Apple Music Wanna know how to add music to your Apple Music library, even from your own music? Here's the...
I have done a clean install of Spotify and this has not corrected the issue. Another person in chat has experienced this issue: https://community.spotify.com/t5/Chat/Local-files-won-t-play-in-offline-mode/m-p/5214870/highlight/t... More screenshots: Baffling advice received from ...