Movies do not show on my Plex

Plex Media Server Desktops & Laptops
2
  1. activate debug logging (not ‘verbose’!)
  2. quit Plex Server
  3. wait 1 minute
  4. start Plex Server
  5. wait 5 minutes
  6. fetch log files and attach them here

Or inspect them yourself. Take a look at the Plex Media Server.log file and seek for messages about database corrupt or malformed.
If you find these, you may have to repair your database.
https://forums.plex.tv/t/there-was-an-unexpected-error-loading-this-library-when-accessing-all-movies-server-bug/237460/24
the above link replaces this https://support.plex.tv/articles/201100678-repair-a-corrupt-database/