I cannot "add" local files to Spotify on the iPhone.
I've followed the directions to add them on my macbook, created a playlist, that's perfect.
I open Spotify app on phone, the playlist shows up.
I tap the playlist, and instead of seeing the tracklisting, I see "Want to add to songs to this playlist?" and then I can "Browse".
The songs should be there already, I thought.
I've included 2 pictures. The playlist in question is "Leaving it all Behind".