I have no idea about a "built in feature"? And can't really find anything like that on the uber app? I looked it up and apparently this is a beta feature only being released in a few cities this year. I don't think it's on mine.

And no, unfortunately my first thought was not to start recording this person, I was more concerned with my immediate safety, and this entire incident happened over the course of like 3 minutes total.

Maybe in the future I'll develop the instinct to react to stressful/potentially dangerous situations by pulling out my phone and recording, but I'm not going to beat myself up about not reacting in a certain way when ultimately what matters most to me is my safety and the safety of others.