It's a 2016 astra. With an inbuilt sat nav and audio system which has Android auto.
I plug my phone in the symbol appears on the touchscreen and I can access Spotify, Google maps, etc.
But sometimes there's no symbol. I try turning system on and off, same with phone. Uninstall and reinstall on phone.
Sometimes this works. Sometimes it does not and its gone for days and then randomly comes back.
Might the car system need an update.