Can I use Spotify and my own music (Epix 2)?

I have Spotify installed and I can use a playlist without issue. However, I have personal music I want to listen to occasionally. I linked my music on the Garmin Express app and transferred the files successfully but I have no idea how to access them on my watch. All I get is the Spotify interface.

I'm starting to think I can only have one music source at a time. Is there a way to switch between Spotify and non-Spotify libraries on my watch?