89552_sd.mp4 -

: 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.

: If the file does not open automatically, you may need a universal player like VLC Player or professional software like Adobe Premiere or DaVinci Resolve for advanced post-production. 89552_SD.mp4

: 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 : Use the "What's on your mind