I had to change phones, the new phone, an Xioami Redmi Note 8 Pro, does not work with the car, even though the Samsung A30 worked well.
As soon as I plug the phone into the car, a box at the bottom wants to know about file transfers, files only, photos, nothing, Cancel. "Nothing" is checked. Whether I tap it or not, the box disappears in a second or two and then reappears a couple seconds later, over and over and over, so much that the phone is afaict worthless when plugged into the car.
I tried to uninstall Android Auto (to reinstall it) but after I tap Uninstall twice, it offers me Update, not Install. That seems strange! Still I coudln't find Android Auto in the display of icons or any list. How do I know for sure it's not installed anymore?????
-----The problem seems to be that it is time to Update Android Auto, but when I tap on Update, the circle just spins around the logo and it says Pending for 10 or 20 minutes until I cancel it. When I do this fr om the playstore entry on the web, tthe same thing happens on the phone, of course.
When I went to Help for Android Auto it said to turn Development Options off (which sounds related since Dev Options is what you need to transfer files, iirc) and it took me to the right Settings page. I turned it off, but it didn't help. I restarted the phone. Didn't help. After that, tapping Android Help took me not to the original page that described way(s?) to make it work, but to a shortened page with no info.
This phone is 2 years old but little used, never dropped, and works well in most other ways, although when I try to use it as a hotspot, it doesn't connect as readily, and the icons in the systray (Globe when not connected, rectangle (image of wide screen monitor) when almost conected, and radiating quarter circles when fully connected) often stop at the rectangle. Sometimes they never appear and even though it's working it's always the image of the monitor! That never happened with Samsung.
Also, the home page and other icon pages of the Samsung had a search line at the top, to look for an app if I can't find it. This one has nothing like that. Is that an issue with the Launcher? If I change launchers is it hard to get the original mone back?