We'll need to check if the runusb user can access the mountpoint

Permissions is broken and MOUNTPOINT_DIR in runusb will need updating so metadata is found

robot@robot:~ $ sudo ls -l /media/
total 4
drwxr-x---+ 3 root root 4096 Jul 26 21:55 root
robot@robot:~ $ sudo ls -l /media/root/
total 16
drwxr-xr-x 7 root root 16384 Jan  1  1970 F96A-B13B

Also you haven't enabled the systemd service.