If it is in a subfolder named , it is a video you sent to a contact or group.
If it is in the main folder, it was likely received from someone else. VID-20210920-WA0033mp4
: A sequence number representing the 34th WhatsApp video handled on that specific day (starting from 0000). If it is in a subfolder named ,
: Short for WhatsApp , identifying the app that generated the file name. VID-20210920-WA0033mp4
This file is typically stored in your phone’s internal storage under: WhatsApp > Media > WhatsApp Video .