Because this is a generic filename assigned to millions of different videos shared on that specific date, there is no single "useful post" or global "viral video" associated with this exact name. It most likely refers to a personal or local video shared within a specific group. If you are trying to find a specific video:

: A unique sequence number assigned by the app for that specific day. Context and Origin

: The date the file was saved to the device (September 13, 2021). WA : Short for WhatsApp.

: Sometimes specific "scare" or "prank" videos are circulated with their original WhatsApp filenames intact.

: Often used in legal or news contexts to identify a specific piece of amateur footage (e.g., news reports from Patrika or The Quint frequently list WA-formatted files in their media archives).

The filename is a standard format used by WhatsApp for videos saved or shared on its platform. The name breaks down as follows: VID : Indicates the file is a video.