Are you trying to this specific file into an editing program, or did you receive it as a final export ? After Effects Tutorial - Importing Basics
: All visual and audio information is contained within that one file, making it a "solid piece" that cannot be separated into original source layers without further editing. Technical Context 1_5044358395306443431mp4
When you see or use this term regarding a video file, it usually indicates that the file is being treated as . Unlike layered project files (like Photoshop or Illustrator files), video files are essentially "flat". Are you trying to this specific file into