For those who utilize Plex to view their media libraries, I've come across this updated Metadata Matching Agent that looks to be an update from an old deprecated agent. Follow the instructions on their GitHub to download the files that will be inserted into your local Plex program files. They have a pretty thorough document you can download that goes step-by-step on how to install the plug-in.
https://github.com/CodyBerenson/PGMA-Modernized
The code basically does a search from the filename and I personally use GEVI (gayeroticvideoindex.com) as my key database. Using the following template for each movie, the site searches for poster art, descriptions, and even actor photos and names.
The more checkboxes for agents you select, the longer it will take to match, so I only keep GEVI checked. If it doesn't match, I try searching other sites and then turn those on when needed to do a specialty match.
I can't recommend this enough, if you're OCD like me, and want everything to be uniform, it's a HUGE help in organizing and classifying your media collections.