Create a playlist that contains all songs. (This appears easiest to do on a computer connected to your Apple Music account - I haven't figured out a way to realistically do this in iOS 10). Go to the playlist on your phone and force touch on the playlist and choose Download.
Create a playlist that contains all songs. (This appears easiest to do on a computer connected to your Apple Music account - I haven't figured out a way to realistically do this in iOS 10). Go to the playlist on your phone and force touch on the playlist and choose Download.