Correct, files were originally on a Mac. I managed to move them to a Pixel 6, I think.
Following advice here I am using Solid Explorer to move the files within the Pixel, my problem is that I don't know where Android is hiding the data that my app is using (the app is freeware XCSoar - a gliding application).
I can see the XCSoar app with Solid Explorer but I am not allowed to data drop files into the app. I assume this is because Android 14 is hiding the XCSoar data directory somewhere......so I'm stuck, again.
Any help much appreciated
PS the XCSoar app works just fine on the Pixel.