Fullsizerender (2).mov Instant

Are you trying to this file to a different format, or

: When you edit a photo or video in the iOS Photos app (such as cropping or applying filters) and then share or export it, Apple often renames the resulting file to "FullSizeRender".

: Apps that process iPhone media (like specialized camera or editing apps) may use "FullSizeRender" as a default name for the final rendered output.

: The "(2)" in the filename suggests that a file with the same name already exists in the destination folder, leading the operating system to add a number to prevent overwriting the original.