Note: for the Plex Pass version the package name you want is “plexmediaserver-plexpass” instead. Those instructions were specifically for the plain version since that person did not appear to be a pass-subscriber.
Also, the commands referencing the service will need to be changed to add “_plexpass” for an install using the Plex Pass version. So:
iocage exec plex sysrc "plexmediaserver_plexpass_enable=YES"
for example on that one.
See the original TrueNAS form post I reference at the bottom. My instructions are the same, they just omit trying to move the server data storage to a different pool since it’s not a necessary action.
Moving the data from your old server over isn’t hard, but you need to make all the mount points on the new jail the same as the old one for it to be most successful. I can post that later.