: The date the video was saved or sent (August 22, 2021). WA : Stands for "WhatsApp."
: If you have the file on a computer, right-click it and select Properties (Windows) or Get Info (Mac). Sometimes the "Origin" or "Description" fields contain hints, though WhatsApp usually strips this data for privacy. VID-20210822-WA0189mp4
Because this name is specific to the person who originally saved or shared the file, there is no public "guide" or information available for it online. : Short for "Video." : The date the video was saved or sent (August 22, 2021)