I already checked the permissions for the drive and they’re all as they should be, so that’s not it either.
Also LOL I was talking about Death Race 2000, I picked the least clear example, my bad
I did delete an existing file, re-added it, and re-ran the library scan, and it still didn’t show up, so I don’t think that’s it, but I haven’t done the Plex Dance yet, so I’ll make that my next step – thanks!