Synology NAS model?
DSM version?
Please verify the installed version of Plex Media Server, PMS. 4.57.4 is the version of the web interface, Plex Web. The PMS version is in Settings → Server_Name → General (just scroll down a bit and you’ll see it).
These support documents contain helpful information:
Installation & Setup of Plex Media Server on Synology
Synology FAQ (DSM 5 & 6) - Questions, Answers, and a few How-To’s
DSM 6: The version of Plex Media Server in the Synology Package Center, 1.18.5, is a year out of date. For best results, download the current version from plex.tv/download and perform a manual installation. See the Installation & Setup Guide and FAQ for instructions.
Make sure you follow Plex organization and naming requirements for your media. See Plex Docs → Your Media for details.
Plex is especially picky with TV Shows. Follow the guidelines explicitly for best results.
Plex does not support mixing TV Shows and Movies in the same library. They must be separate.
DSM 6: Not that you have, but do not put any media in the /volume1/plex shared folder. This will cause problems with Plex. Unfortunately, there are several YouTube videos that say otherwise, leading people to make this mistake.
A naming / organization example. The files can be in most any location except those mentioned in the setup and faq. The important part is to keep media types separate and follow Plex naming requirements.
/media
../movies <-- Movie library points here. Exact folder name unimportant.
..../Avatar (2009) <-- movie_name (year)
....../Avatar (2009).ext <-- movie_name (year).ext (ext = mkv/mp4/etc)
../tvshows <-- TV Library points here. Exact folder name unimportant.
..../Band of Brothers <-- show name
....../Season 01 <--"Season" must be in English. Use two digits for season number.
......../Band of Brothers - s01e01.ext <-- "s01e01" is the important part. Read docs.
