

Programs ran through Flatpak can only access permissions and directories that it has explicit permission for. This is perfect for a very small program that only does one thing, it can get rather awkward when you need it to access multiple storage volumes. For example, I wanted to have my Steam games stored on different hard drives, but they were never visible through Steam. I had to override the Flatpak permission to give access to my mounted disks for it to work.
Yeah, my instance has a nice big banner that reminds you of that.