Fullsizerender (2).mov -

: This is a standard QuickTime video format developed by Apple. While it is native to Apple products, it is compatible with most modern Windows media players and video software. Common reasons you see this name:

: Sending an edited video via AirDrop or email often triggers this automatic renaming. FullSizeRender (2).mov

: 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". : This is a standard QuickTime video format

If you need to revert the video to its original unedited state, you can usually do so within the iOS Photos app by selecting the video and tapping . : When you edit a photo or video

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

: 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.

: Services like Google Drive or NextCloud sometimes rename edited files to this during the upload process.