2_3boobs-liurfbfv.mp4 ... -

If it's a tech demo, the "useful feature" might be a specific software trick or setting.

Sometimes these IDs refer to specific educational modules. 2_3Boobs-liUrfBFV.mp4 ...

Because I don't have access to your private files or specific offline databases, I can't "watch" this video to tell you its features. However, the alphanumeric string looks very much like a unique YouTube video ID or a similar hosting tag. If it's a tech demo, the "useful feature"

Could you clarify what this video is about? It might be one of a few things: If it's a tech demo

If it's from a specific YouTuber or streamer, I can look up their recent "useful features" lists if you provide the creator's name.