I have a car radio with android, it want recognise the front facing camera.

[Android Central Question]

I have installed a chinese unit running android 8 into my car. It has DVR but it wont recognise the camera, which is connected via a usb port. I have tested the camera on my laptop and it works, and i have plugged an mp3 player into the usb port and the unit sees and runs the music ok. What else could it be