[cesarb]

> I really hate it when I need to send a single file or photo, an app suddenly "needs access to my filesystem" and I have to grant that access.

There's another way: the app could instead use Android's Intent system to request a file chooser. This switches to a separate app which already has access to the filesystem (like the built-in Gallery app), which after the user has chosen the file, returns something which allows the original app access to just that file. This mechanism exists since the first version of Android.

[amelius]

I think this won't work because the app can get away by asking (insisting) for more permission than it actually needs.

[devxpy]

exactly.