Plex media server can't load IP address

Plex Media Server NAS & Devices
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We have a bit to unpack. The most important thing is don’t struggle too much. You found the right people, and we should be able to guide you from here.

  1. Like ChuckPA and dbirch mentioned, we learn the most from putting your server into debug mode, restarting it, demonstrating the problem for a short time, then getting logs. You were directed to find them in the PlexMediaServer shared folder. Below there somwhere, you’ll find one named Logs. I’m guessing your server was in debug mode. That’s the default.
  2. ChuckPA has authored the Syno FAQ here on the forums, and it’s very important to follow the tips in there, because Synology NASes are uniquely complex.
  3. At the bottom of every forum page are the Plex Articles, which are the user manual basically. I refer to them all the time.

So with some general things out of the way, your problems. I would suggest getting PMS installed with a dozen films and a couple of TV series so that it’s happy. Then I would experiment with Remote Access. Keep it simple and small for now, otherwise you’ll swamp PMS to some extent. Let’s just get normal access on your LAN working.

Chuck mentioned your DNS and gateway being important.
PMS on a NAS works best when the NAS has a static IP address. Does yours?
PMS on a NAS resolves hostnames the best when set to use two public DNS servers, e.g.

Primary DNS server:    1.1.1.1
Secondary DNS server:  9.9.9.9
ipv6 DNS server:       2620:fe::fe

PMS on your NAS should have a reachable default gateway. Chuck is suggesting you check your NAS for these settings. Proof that those three things work would be to ssh into the syno and
ping www.google.com

Let’s see how you manage with this knowledge and what you can gather.
Good luck!