Rolfe unfortunately your phone has a very old version of ANDROID 8.1 It was released in 2017.
Android Auto has now been integrated into ANDROID 10 and above. So unfortunately your phone is incompatible with Android Auto and any car that can connect to it.
Your phone however, has been linked via bluetooth so that hopefully the iSMART app can work.
Reference your question about CD playing on an MG well as you know the MG does not have a CD player. Infact I'm not aware on any new car that comes with a CD player. The only thing you can do is use your PC or Laptop, that may have a CD player, to RIP the songs to MP3 files like a student from the 1980s. There are plenty of illegal ways to do this just do a search on Google. However, I would suggest you join one of the streaming services like Spotify or Amazon Music because it makes it so easy to listen to an enourmous range of music genres. Being 71 I obviously only like Grunge and Techno.
Seriously, the time saved in not having to rip, process, copy to USB, is well worth a couple of Lattes. Spotify is now £9.99 per month and Amazon music Unlimited is £8.99 per month. Amazon music is offering a free 3 month period to try it out if you are interested.
Amazon Music Unlimited | 90 million songs ad-free
If you are an Amazon Prime member you get a pretty good cut down version. It just doesn't have the 'Latest' music on there. That's why MG offered Amazon Music on the MG ZS EV Trophy Connect when released.
By the way I actually listen to Smooth Jazz and Classical, as well a audible books when I drive.