Playing Spotify in Chevy Truck

[RJSAK]

I can't figure out how to play spotify from my phone to my car, which is a 2015 Chevy Silverado truck. I've read seveal of the discussions in the community, yet still haven't figured out if it's possible. I have the phone plugged into the USB in the truck's console, and successfully paired/connected via bluetooth; the truck uses what's called 'MyLink'. Further, I can play music that is downloaded on my phone (not on Spotify) through the truck speakers, using 'Rocket Player'. But, when I look at 'Divices Available' on Spotify, I can't find the truck... Any suggestions?

Thanks!