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I've imported my local files, and added them to a playlist. They're m4a, and play just fine on my desktop. When I launch Spotify on my iPhone, the playlist shows up but no songs are there and there's no option to play the playlist. 

I've tried all the answers I can find. Spotify is running on the desktop. Both devices are on the same wifi network. I can start the playlist on the desktop and when I do the iPod can control it, start, stop, skip track. But I can't launch the playlist from the phone, nor can I view any of the songs (all local files) on the phone. 

How do I get them to show up on the iPhone? I realize that this only works when I'm on the same wifi network. But I can't even get it to work then.