Uploading a Marketing Film

Hello! Would anyone be able to advise please the best way to feature a marketing film (similar to an advert) - as I know the banner carousel doesn't support videos, but I'm trying to upload to the News section and it doesn't seem to be working... is there a max file size for videos, or does it always need to be hosted elsewhere, like on a Zoom platform and just the link added in?

Thank you!