Okay, I think I've figured out that I shouldn't need to because the file will be generated automatically with the required values added based on code statements, but I'm still not sure why I wouldn't need to add a string explaining why, e.g., Privacy - Location services is being used.

So this is another major 'duh' - I'd downloaded Xcode beta 13 last Monday and, as I said, the sample app was running fine. Somehow later in the week when I started using right-click 'open with Xcode-beta' it was opening the sample with Xcode beta 12.5 and I didn't realize it - but that's why I was getting all of the errors. I've deleted Xcode release and the 12.5 beta, and now i'm opening with xcode beta 13 and all is well again.

Well, it suddenly occurred to me that I am using my iPhone (11 Pro Max, no LIDAR) rather than my iPad (12.9 Pro, 4th gen, LIDAR) to record the video. I recorded this time with the iPad, and the black screen issue is gone; I will continue to test to make sure the rest works.

I had no problem building and running. But I have noticed this week that sometimes by default a project intended for iOS 15 Beta and/or Xcode 13.0 Beta may by default open in Xcode 12.5 and I'll get all types of errors until i realize that i'm in the wrong version of Xcode. Now I generally right-click on project files and specific 'open with Xcode-beta'. Are you sure you're opening it up with the correct version?