The installation using Flatpak does not install the 3D symbols. These can be installed to a folder in the user’s home directory, but modifying the paths in KiCad to point to the 3D symbol libraries only works for the current session. After restarting KiCad the path reverts to the Flatpack’s sandboxed path.
How can we create a on-volatile path external to the sandbox to access the 3D symbols?