When a video is "cached" to load faster for you, it is often stripped of its descriptive name (e.g., "vlog_final_v2.mp4") and assigned a cold, efficient number.

Platforms like Pexels, Shutterstock, or Pixabay assign these IDs to track downloads and licensing.

The filename follows a pattern commonly used by stock footage platforms, content delivery networks (CDNs), or automated video hosting services.