Is it possible PLEX is deleting movie files?

General Discussions
1

Some of my movies disappeared from my PLEX library. I went to check my synology server and the files were gone too.

Is it possible PLEX is deleting movie folders?

I added these movies back and PLEX immediately pulled up my past ratings, etc.

For context, I recently did the following:

  1. refresh all metadata in my library (still hasn’t completed after a few days)
  2. manually triggered “optimize database”
  3. manually triggered “clean bundles”
  4. manually triggered “empty trash”
2

Plex doesn’t delete any files, unless it is instructed to do so.
It will delete files if the server admin (or a person who has access to a device that is signed in to the admin’s Plex account) deletes an item explicitly from within a Plex client: https://support.plex.tv/articles/202606363-how-do-i-delete-something-from-my-library/

It will also delete TV show episodes automatically, if the server admin has set the episode retention to anything other than the default settings, shown below:

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If you are using a Synology NAS, verify that the media files have proper access permissions for Plex to be able to access them.
The upgrade from DSM 6 to DSM 7 brought major changes in this regard: Synology FAQ - Questions, Answers, and How-To's - #37 by ChuckPa