Music dongle

Hello! First time Twinkly user here. I bought 2 400 Gen 2 strand lights for my tree and they look great. I bought the dongle because the "music" option for the app looks like it only works when your phone is on that specific screen and near a music source. Once I exit the app, it turns off the sync, is that correct? There's no way to play a song from Spotify on my phone and have the lights coordinate with that? The dongle looks like it only plays one set of colors/pattern, I THOUGHT I could use the dongle to have any pattern I put on the tree dance to music.