I got a phone interview with the HR. She was very friendly but also seemed not technical at all. So I didn't think the complex answers got through. Didn't proceed beyond that.

You usually watch a video and have a set amount of time to record your answers. The questions will either appear on the screen or the employer may have recorded them in advance. In a pre-recorded interview you will not be speaking to anyone. You will not have any visual clues from an interviewer to encourage you.