Because this is a private file name from someone's personal device or chat, there isn't a public "guide" for it. It could be anything from a family video to a screen recording or a shared meme.
To help you better, could you clarify what you are looking for? For example: VID-20210611-WA0566mp4
Are you trying to a file with this name that you found on your phone? Because this is a private file name from
Are you trying to a deleted WhatsApp video from that date? VID-20210611-WA0566mp4