Vid-20210920-wa0033mp4 -

: The date the file was created or shared, formatted as YYYYMMDD ( September 20, 2021 ).

If it is in the main folder, it was likely received from someone else. VID-20210920-WA0033mp4

If it is in a subfolder named , it is a video you sent to a contact or group. : The date the file was created or