The first few digits of these long numeric filenames are often Unix timestamps. 1617263354 translates to April 1, 2021 . Check your photo gallery or downloads folder for that date. Check Folder Location:
If it’s in WhatsApp/Media , it was sent to you by a contact. 2. How to Open the File If you are having trouble playing the .mp4 : 161726335438.mp4
Drag the file into a Chrome or Edge tab; they can play most standard MP4 formats natively. 3. If you suspect it is a "Screamer" or Troll Video The first few digits of these long numeric