Yeah looks like user “plex”
so you might need to run “sudo su - plex” this will prompt you for password and use your bob password in order to become plex, sorry different linux distros act in different ways…
Final step no you should not need to add a user named plex on the NAS at all that is just who would own the mount on the linux side you use the media/password account for the NAS so changing uid from bob to plex will not require a user be added to the NAS.
