: This is the original sequential filename generated by the camera's firmware.
: This alphanumeric prefix is likely a unique hash or identifier assigned by a software application (like WhatsApp, Discord, or a cloud backup service) when the file was processed or uploaded. f20df504_IMG_3576.MOV
: This indicates an Apple QuickTime Movie format, a common container for high-quality video recorded on iPhones or digital cameras. Why this file might be on your device : This is the original sequential filename generated