Newly added movies are not showing up

No.

Your media naming & organization does not align with Plex guidelines. This is causing problems with Plex’s database (notice all the SQLITE3 messages in the log file).

Current naming & organization (from your log files):

/volume1/video/Westworld.S03E01.720p.WEB.x265-MiNX.mkv
/volume1/video/True Detective Season 3 Mp4 1080p/True Detective S03E08.mp4
/volume1/video/Noah/Harry Potter and the Deathly Hallows Part 1 2010 1080p x265.[PRiME]/Harry Potter and the Deathly Hallows Part 1 2010 1080p x265[PRiME].mkv

Items to correct:

  1. Poor location. /volume1/video is used by Synology and can cause problems when used by Plex (Synology FAQ #6).
  2. Wrong naming convention for TV shows. This will cause problems with Plex, which is very picky with TV show naming and structure. See Naming & Organizing Your Media.
  3. Wrong naming convention for movies. This can cause matching issues for Plex. Use /Movie (year)/Movie (year).ext. If you must keep resolution, encoding, etc info, put it in square brackets: /Movie (year) [other stuff]/Movie (year) [other stuff].ext. This post provides detailed info on how Plex matches movies & shows and how extraneous information can cause matching issues.
  4. Wrong file organization. Do not mix TV Shows and Movies in same library.

You need to rename and restructure your media.

See Installation & Setup of Plex Media Server on Synology and the Synology FAQ - Questions, Answers, and a few How-To's, especially FAQ #6 & #7.

An example:

/TV  <-- TV Library points here
  /Westworld
    /Season 03
      /Westworld - s03e01.mkv
  /True Detective
    /Season 03
      /True Detective - s03e08.mkv

/Movies  <-- Movie Library points here
  /Harry Potter and the Deathly Hallows Part 1 (2010)
    /Harry Potter and the Deathly Hallows Part 1 (2010).mkv
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