Comment 4 for bug 1521292

Just a quick comment to note that we're hitting this issue with the ScummVM engine as well; as a result I'm only able to distribute this through the Open Store: https://open.uappexplorer.com/app/scummvm.michael-sheldon so that it can read from locations that users can copy files to over MTP.

Unfortunately the snappy solution proposed above won't help for ScummVM or a number of similar game engines, as whilst the engine itself is freely redistributable, the game content isn't. The user has to purchase a copy of the game from the original developer and then copy across the data files themselves.

Exposing app data directories over MTP as Jamie suggests seems like the nicest solution to me.