What you need to do in a rapid prototyping round?

I'm interviewing a company, where one round is rapid prototyping round? I have never given this round earlier? Even though they are saying it's figma understanding, ui analysis round. But due to unfamiliarity I'm asking in the community.

Few things I'm looking for -

1. What will be the evaluation criteria?
2. What kind of brief they might give?
3. What things do I need to do?

Anything related advice.

TIA.