Plex always listens on the machine’s natural LAN address. That will automatically be registered as the first entry, and doesn’t need to be manually entered.
If additional entries are needed, I don’t think the order of the Custom server access URLs matters or is preserved.
I’m pretty sure that this is the order:
- Local LAN IP : 32400
- All
Custom server access URLsentries, ordered randomly - Detected Public Internet address, if
Remote Accessis enabled