: The date it was created or processed by WhatsApp (August 11, 2021). WA : Standing for WhatsApp.
If you are looking for the original source of a video you found with this name, you can try the following: Download File VID-20210811-WA0038.mp4
: On Android, these files are typically stored in: Internal Storage > Android > media > com.whatsapp > WhatsApp > Media > WhatsApp Video : The date it was created or processed
: If the video is a clip from a show or movie, you can take a screenshot of a clear frame and use Google Lens to search for the original source. Download File VID-20210811-WA0038.mp4