If you want to record a Blitzz session (video + audio) directly on your computer, you can use a third-party screen-recording tool. Below are a few recommended methods.
Recommended tools and methods
Chrome Browser
Use a screen-recording extension such as Screencastify (free Chrome plugin) to capture your session.
Mac
Use Quicktime Player to record your screen — it can capture both video and audio during a Blitzz call.
All Platforms (Windows/Mac)
Use a desktop screen-recording application, such as Camtasia (a free trial is available). It runs in parallel with your Blitzz call and allows you to save the session locally on your drive.