Gladiator.2.2024.480p.HDRip.x264-DM.mkv
Or for Plex:
It looks like you're asking for the (likely meaning the filename itself or a scene/release title) for a specific movie file. Gladiator.2.2024.480p.HDRip.DesireMovies.MY.mkv
Gladiator II (2024) [480p] [HDRip].mkv
The full text you provided is already the filename: Gladiator