Are appimage files supposed “work” on the Librem 5? I downloaded one, but no amount of pounding on the icon with my finger makes it do anything. Don’t know if that’s a current limitation of the phone, or if there’s something wrong with my device and/or its configuration.
You need to download an image for the ARM64 architecture. Otherwise, you might try your luck with emulating amd64, but that’s involved.
In that situation I would usually bring up a shell window and launch the application from the shell, in order to see whether it is crapping out immediately with some error.
Also make sure its executable.