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• Snap runs in a sandbox.
• Permissions of the sandbox are defined in the package itself
• when possible install from channel --stable which typically offers the app enough permissions to run normally
• if not possible to install as stable install with devmode to be able to read files…or something
• it appears Snap apps can't even see certain directories like /tmp and /home. Symlinks don't fix the problem. Instead the files need to be copied somewhere else, such as /var/tmp