: Use the "What's on your mind?" field to attach the video. Note that Facebook groups may have specific templates or requirements, such as photo IDs for some custom forms.
: Be aware that video files like MP4s may not always retain pre-filled description headers in certain services (e.g., Google Photos ), so you might need to manually re-enter your caption during the upload process. Writing an MP4 Muxer for Fun and Profit - OBS Studio 89552_SD.mp4
: As an MP4, this file is a versatile container for video, audio, and subtitles, making it compatible with most digital platforms and smartphones. : Use the "What's on your mind