You can easily share your desktop screen to iPhone for video recording.
This can be handy for recording video presentations or internal demo's where you have your slides or notes available on your desktop and want to use your iPhone camera to record over it.
To do so, just share a link from your phone to your desktop to connect your phone and desktop. Allowing you to mirror your desktop screen directly on your phone and allowing you to mirror anything on your screen or browser.
In short:
Click the 👤+ icon in the top right corner.
Click on Share Invite and paste the link in your desktop computer.
At the bottom of the screen there is the option join via browser.
Click the Join Video button.
Click the 💻↱ icon to share a screen or tab.
On your iPhone you can change the layout by placing the mirrored screen in the back or foreground while you talk over it.
Hit record.