(3) Mp4: Vid01

: Apps like WhatsApp or Telegram sometimes rename media files using generic strings when saving them to your gallery.

: This is the file extension for MPEG-4 Part 14 , the most widely used digital multimedia container format for playing video and audio on almost all modern devices. Why do I have this file? Vid01 (3) mp4

: This usually indicates a duplicate file . Most operating systems (Windows, macOS, Android) add a number in parentheses when you download or save the same file multiple times to the same folder without overwriting the original. : Apps like WhatsApp or Telegram sometimes rename

To find out what is actually in the video without a descriptive title: : This usually indicates a duplicate file

: You may have clicked a "Download" button on a website three or four times, resulting in multiple copies.