Files could be store in object which inherits form System.FileDocument; Those files can be used in the app, as they will be synchronized. Though take in account, that the file transfer are incremental, based on change date. Big files will make synchronization slow. Please consider using external services for hosting video (and audio) content, and use URLs link to them
Also for the web there are some options too https://appstore.home.mendix.com/link/app/110700/
Are you guys aware of any real-time option, to capture a video stream from a camera/url like rtsp://174.141.XXX.YYY:554 ?
It seems the widget you suggested for the web doesn’t do it.