The name is a standard filename for videos recorded on Apple devices. Because this is a generic filename, there isn't one single "official" version of this file online. Could you clarify which you need?
: Are you trying to download this specific video from a platform like iCloud , Google Drive , or Google Photos ? Download File IMG_3905.MOV
It's a bit unclear whether you are looking to a specific file yourself or if you are looking for instructions on how to build/program a file download feature for a website or app. The name is a standard filename for videos