How to record & export audio
When you click Record, your browser will open a share dialog.
Select the
Chrome Tab option, choose this tab, and tick
"Share tab audio" at the bottom.
Then click Play — the speech will be captured. When done, click Stop Rec and download your file.
Alternatives: Windows: Win+G → Game Bar → Record | Mac: QuickTime → New Audio Recording | OBS: Audio Output Capture source