Hi GRCBrussels, I see that after updating the iOS version on your iPhone you are having an issue creating a music playlist. I listen to music on the go all the time and use playlists a lot. So, I can imagine you are ready to get this issue resolved. I'm happy to help. For assistans with this issue, I recommend taking a look at the iPhone User Guide, specifically, this section: MUSIC
Playlists
Create playlists to organize your music. Tap Library, tap Playlists, then tap New Playlist. Enter a title and description, tap Add Music, then select music to add to the playlist.
You can also tap
in a track list or, on the Now Playing screen, tap Add to a Playlist, then tap New Playlist.
Customize your playlist’s artwork. Tap Edit, tap
, then take a photo or choose an image from your photo library.
Share a playlist. Touch and hold a playlist, then tap Share Playlist.
3D Touch. Press a playlist, then tap Share Playlist. See 3D Touch.
Create a public playlist. Select a playlist, tap Edit, then turn on Public Playlist.
Edit a playlist you created on iPhone. Select the playlist, then tap Edit.
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Add more songs: Tap a playlist, tap Edit, tap Add Music, then choose music from your library.
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Delete a song: Tap a playlist, tap Edit, tap
, then tap Delete. Deleting a song from a playlist doesn’t delete it from iPhone.
-
Change the song order: Drag
.
New and changed playlists are added to iCloud Music Library and appear on all your devices if you’re an Apple Music member or iTunes Match subscriber. If you’re not a member or subscriber, they’re copied to your music library the next time you sync iPhone with your computer.
Delete a playlist you created on iPhone. Touch and hold the playlist, then tap Delete from Library.
3D Touch. Press a playlist, then tap Delete from Library. See 3D Touch.
Please let us know if this helps.
Have an amazing day!