0h147u4bt2fstxh24b4p0_source-erlurz9j.mp4 — Secure & Complete

Do you remember you originally downloaded this file from? How to play MP4 files in Windows - Microsoft Support

The system creates different versions of the video for various internet speeds. The "source" tag in your filename suggests this is the original high-quality version before it was compressed for mobile viewing. 0h147u4bt2fstxh24b4p0_source-erlURZ9j.mp4

The "long story" behind such a file name usually involves the following lifecycle: Do you remember you originally downloaded this file from