Why can't I use Google Music through the Built-in Player?

Playlists made in the Google Play Music app do not work with Zombies, Run!'s Built-in Player. We've spoken directly with Google and they have told us their API does not support the integration that we require so unless something changes in the future this isn't a problem we can fix, unfortunately. 

To use Google Music, you'll need to use the External Playlist function. To do this follow the steps below:

1. Open Zombies, Run!, and select a mission
2. Tap on the 'Music' button on the mission's selection screen and select the 'External Playlist' option.
3. Open up Google Music and start your chosen playlist.
4. Go back to Zombies, Run! and start your chosen mission. Your music should be automatically paused for the first mission clip, and resumed afterwards.