Thank you!!! I've been beating my head over this for several days. It worked - not quite magically, but it worked. After I switched the target, it didn't appear. I tried a couple of different versions, then shut down the app, exited xcode, reopened app, did a clean build, still not there. I went into the project editor and now when I hovered over items in the 'Custom iOS Target Properties', it gave me +/- symbols to add a line item - i added the Privacy - Location, and as soon as i did, the file DID (magically) appear in the file navigator. I also noticed that when I switch back to 15, it doesn't (thankfully) magically disappear.
Thanks so much for taking the time to answer this!