Apple devices use the IMG_XXXX format. Once a device hits IMG_9999 , it typically resets to IMG_0001 in a new folder.
Are you trying to with this name, or did you see it mentioned in a specific online story ? IMG_2736MP4
If you see a link to "IMG_2736.MP4" in a suspicious email or a random Discord message, do not download it . Hackers often use generic filenames to trick people into downloading malware or "zip bombs." Apple devices use the IMG_XXXX format