I get why you're asking — Midnight (Nemuri Kayama) is one of those characters who feels like she should pop up everywhere in 'My Hero Academia', but the movies treat faculty pretty differently than the TV series.
From what I recall watching the theatrical films, Midnight doesn't have any major starring moments in the big screen adaptations. The movies usually focus on the students or introduce new movie-only villains and heroes, and the pro heroes who get screentime tend to be the heavy-hitters like All Might, Endeavor, Hawks, etc. That means teachers like Midnight are more likely to show up as background or in group shots during ceremonies or press scenes, rather than getting a dedicated scene or combat moment. I, for one, always scan crowd shots hoping to spot little cameos — it’s a fun game — but I wouldn’t expect substantial character development for her in the films.
If you want to be absolutely sure, check the movie credits or a reliable cast list (Anime News Network, MyAnimeList, or the official Blu-ray booklet). Fans also timestamp cameo appearances in forum threads and clips on YouTube, so that’s where I usually verify a quick sighting instead of relying on memory alone. Either way, if you want more Midnight stuff, the TV seasons and certain OVAs give her a lot more presence and personality than the movies tend to allow.