Plex Movie Agent skipping some local metadata fields (e.g. sort title), other agents read sort title metadata correctly

[FordGuy61]

Plex Movie Agent settings are configured on a per library basis, not in Settings → Agents. Also, reading embedded metadata from mp4/m4v files is turned off by default.

See this thread:

I don't like the new movie scanner agent. It ignores my custom MP4 tags

Plex Documentation → Scanners & Agents → Advanced Settings Plex Movie Agent → Advanced Settings Plex TV Series Agent Plex Documentation → Libraries → Editing Libraries Plex will read embedded metadata from mp4 files if configured to do so. However, the setting @dokuro mentions, which enables the capability, is off by default. Edit the library to enable the capability. If Plex does not do so automatically, refresh the library metadata after changing the setting. See the documentation …