MP3 is the format that taught music to travel: small, scrappy, and welcome absolutely everywhere. It was born in 1993, Fraunhofer Institute, Germany, and its real weak spot is holding fine detail at low bitrates: it stays small by quietly discarding sound.
Video is the heaviest thing most of us ever attach: screen recordings, camera clips, whole talks. Stands in for any video format Flippy can read: MP4, MOV, MKV, WEBM and the rest. That makes it the right destination when what you need is any moving picture: recordings, rips, exports, downloads.