Follow these steps to have Plex Media Server ignore a directory.
So let’s say we have a folder: C:\vids. In it, you have two normal folders “youtube” and “movies” that Plex scans and adds to its libraries. But let’s say we have a “private-vids” folder in there that is hidden in Windows Explorer that you don’t want Plex to scan. What you do is create a file called “.plexignore” and put the folder followed by “/*” as the value. Plex will then skip it. In Powershell, this looks like:
Set-Location C:\vids (ni -ItemType file -Value "private-vids/*" -Name .plexignore).attributes="hidden"
Now you can verify:
cd c:\vids ls # Shows "youtube" folder and "movies" folder ls -Hidden # Shows "private-vids" folder and ".plexignore" file cat .\.plexignore # returns: private-vids/*