See also here as apparently the udev rule in the source is not surviving reboot:
https://github.com/NixOS/nixpkgs/blob/nixos-25.11/nixos/modules/services/hardware/udisks2.nix
services.udev.extraRules = lib.optionalString cfg.mountOnMedia ‘’
ENV{ID_FS_USAGE}==“filesystem”, ENV{UDISKS_FILESYSTEM_SHARED}=“1”
‘’;