When you say it doesn’t show up, does it not show up with the other films, or does it not show up at all if you try searching the library for “Raiders”.
For me sometimes with series all except one movie will be grouped together. So three of the four movies will be under something like “Indiana Jones” and the other one will get listed as “Raiders of the Lost Ark” under “R”.
Other times to test what’s happening I’ll go to Settings->Troubleshooting, click “Optimize Database” and “Clean Bundles”. Then, add a new folder with just that one file in it via “Manage Library”->“Add Folders”. Which is kind of me just being lazy to avoid the “Plex Dance”:
If one of those fixes it Plex might be wonky because it thinks you deleted it or something, and optimizing the database, adding it back to its proper folder/filename, and waiting should eventually fix it.
You can also try adding it to an “Other Videos” library to see if Plex sees it there.
Have you used any type of utility to check the file, just in case? Even if the permissions and encoding characteristics are the same.
A few times I went the nuclear option and removed all library folders. “Optimize Database” and “Clean Bundles”. And then add the library folders back and let the whole thing rescan.
