@andrewilley It can play audio over Bluetooth, and it can play audio through the USB. However, there are 2 different modes for playing audio over the USB connection...
The system can access the phones storage and copy the audio file to the car's internal storage, or it can just play the audio file straight from the phones storage <- (Im not 100% how to check if this method plays audio files over USB DAC or just USB)
You can switch to use Android Auto from the infotainment screen, and that's where I can use Poweramp to play music