2nd gen Joying Head Unit Thread

Hi all,
Just received my 9" with knob android 13 head unit. I'm still waiting on the harness that shipped separately and have a couple questions before install.

Included in the box are two 4g antennas and a 5g/wifi/BT antenna. I plan on using my hotspot for anything that requires a connection. I'm assuming I don't need either of the 4g antennas.
I would like to use wireless Android Auto, so assuming I'll need the 5g/wifi/BT installed. Am I correct with these?

I have a 2014 with JBL large screen, is there a factory gps antenna installed already that will plug into the new unit or do I need to run the included GPS antenna?

Last question,
The included yellow AR video in and OCD_12v out pin are only needed for a front camera correct?
I only have a backup camera in the tailgate.

Thanks a ton in advance!

 

Those sliders don’t do anything to change audio volume at all from CarPlay for me. 0-10 doesn’t matter, same audio volume on everything, music loud, directions and calls quiet

And I can’t adjust the sound mixing scale. Dunno why, but it’s not adjustable