Have you already checked the “other basics”, e.g. do the WAN IP address of the modem/most outside router and the public IP recognized by Plex match, have you enabled a port forward and is it accessible from outside your home network…?
Have you already checked the “other basics”, e.g. do the WAN IP address of the modem/most outside router and the public IP recognized by Plex match, have you enabled a port forward and is it accessible from outside your home network…?