Check out the Canadian National Film Board web site. They have many films listed for free viewing. Most are educational but their animation is
amazing. I recommend "The Log Drivers Waltz" and "The Rise And Fall of The Great Lakes. also "The Sweater"
I've been looking for one I saw a few years ago. It's about a mysterious box and set in a dystopic future. The authorities are after the box and
there's mayhem and chases as the plot plays out. It's no more than 8 minutes long and the end involves an AI being on a motorbike. IIRC it won, or was
nominated for, an award.
Another oldie is Hellholes about a guy renting a trailer that's like Hellmouth in the Buffy universe. It's got animated parts which kinda justifies
posting it/them.