Can't use USB in car

[rebroadway]

I had the Nexus 6P (with Android 7) and plugging it into the USB worked with my 2011 Camaro (it is not Android Auto, the Head-unit basically will see the phone as a USB Storage device, mount it, index the files, and I could then use my car's controls to search, change tracks, etc).
I broke my phone and turn it in on warranty, and end up getting the Pixel XL as replacement, and upgrade it to Android 8.
Now when I plug it into my car, I get a "No supported media found" message on my car's display. I have tried with and without USB Debugging, going into the the developer options and changing the "Select USB Configuration" to MTP, Audio Source and still the same. I would also have this issue with Samsung phones, and could never get them to work.
I am not sure if this is an issue with Pixel's, or with the Android 8 update, since my Nexus 6P with Android 7 worked fine

 

[c7j8d9]

you need to use the otg adapter that came with it

 

[rebroadway]

So I have to get a standard USB-USB cable to connect the adapter to my car?
I thought this adapter added functionality, so my phone can mount drives, not the other way around? Doesn't make since that something that has worked so well on the past 3 phones (except for Samsung for whatever reason) now no longer works without another piece of hardware. Not what I would call progress

 

[rebroadway]

So I ordered another cable and am using my OTG adapter, and it still does not work.