We’ve been running Cura from a flatpak because the rpm distributed version was out of date. The big drawback, though, is that this flatpak could not see the files from network mounts. The mount is fine – in fstab, same user account can interact with those files in other applications. Just not this flatpak thing.

Turns out that’s normal – flatpaks operate in a sort of sandbox. You just have to tell it to let an individual flatpak access the location where the network mounts are. In this case, the /mnt path:

flatpack override com.ultimaker.cura --filesystem=/mnt