The equipment I ordered and tested (to have both battery and camera attached) didn’t work as advertised, so I ordered another model but it may take a month to reach me. I’m looking for something to test earlier.
Also the programmer sent me a new build for the phone camera software. We found that the zoom issue with external camera is an intermittent issue that is probably a problem with the code library. This means sometimes it will work, and sometimes it wont. But is with respect to the particular camera model I’ve suggested. With other specific models there is never a problem, but they are larger. We don’t yet know the variables that determine if it works or not. The programmer is looking into it more.