Q: Can't make music playlists on iPhone 6S

Hello there, Voric-Ardo.

It seems you're having issues completing steps to create a Music Playlist on your iPhone 6s. Although the following Knowledge Base article is written for applications installed from the App Store, the initial recommended steps can be useful information for troubleshooting:

If an app you installed unexpectedly quits, stops responding, or won’t open

Restart the app

Close the app and open it again.

Restart your device

Turn your device off and back on.

Check for iOS and app updates

Make sure that you're using latest version of iOS.

For additional information on all the features regarding working with Playlists in iOS, this link from the online iPhone User Guide is good to reference:

Playlists - iPhone User Guide

Thanks for reaching out to Apple Support Communities.

Kind Regards.