I am sharing this info out confirming I was able to code under Expert Mode the screen sharing for Android. I use iPhone's but have always had an Android around to use Torque which displays lots of info needed.
This will help on track days.
Searching around I found the following list of parameters which I coded in Expert Mode using the BimmerCode APP. Thanks to
Almaretto and
Gabrola
I coded all these parameters to be aktiv and now my iDrive menu is showing the Screen Mirroring option.
Had trouble initially connecting the phone but it was because its an older Android, tried with Galaxy S6 and S5 and it works.
Did mine using Bimmercode app.. It wasn't all straightforward to find but in expert mode under the display module I just typed in the parameters and the Bimmercode app narrows them down for you, then set them to aktiv.