Video_watermark1668744279705(1).mp4

: This suggests that a file with the exact same name already existed in the destination folder, so the system added a suffix to avoid overwriting the original.

: Apps like CapCut, InShot, or VN that generate temporary cache names during export. video_watermark1668744279705(1).mp4

: Tools that save videos from TikTok, Instagram, or YouTube (often adding "watermark" to the name to indicate the source status). : This suggests that a file with the

: Sometimes messaging apps rename files with timestamps when saving them to a local gallery. video_watermark1668744279705(1).mp4