Don’t let the filenames end in part1and part2 otherwise Plex thinks you want the movie files stacked.
There needs to be at least the release year in parentheses after and maybe some extraneous info about resolution or sound format.
These file names won’t get stacked:
Harry Potter and the Deathly Hallows Part 1 (2010) - 1080p.ext
Harry Potter and the Deathly Hallows Part 2 (2011) - 1080p.ext
(and they’re according strictly to the Plex file name guides)
