If you still have the video file, right-click it and select Properties (Windows) or Get Info (Mac) to see if there are any author names or titles in the metadata.
Since the file was originally shared via WhatsApp, you can only find it in the following places:
Look through your 2021 backups if you have auto-sync enabled. Download VID 20210923 WA0000 mp4
The "full paper" likely refers to a research document or article that this video was meant to accompany. To find it, try these steps:
💡 Files named VID_YYYYMMDD_WAxxxx are private user-generated content and cannot be "downloaded" from the public internet unless they were specifically uploaded to a hosting site by the owner. If you still have the video file, right-click
Based on the filename structure, this is a recorded or shared on September 23, 2021. Because this is a private file format, it is not available in public databases or scholarly archives. 📁 Locating the Video
If the video is about a specific scientific or academic topic, search for that topic on Google Scholar. To find it, try these steps: 💡 Files
Reach out to the person who originally sent you the file, as they likely have the corresponding document.