No sound on Facetime screen recording, microphone WAS on
I was screen recording an important facetime call tonight and when it was finished, there was no sound. The microphone was turned on (and you can see that it is turned on in the video) but there's no sound at all until the very end when I hung up the facetime call to make a regular phone call (all while still screen recording). I can hear my voice and the phone call conversation, but nothing during the facetime call. I've never had this issue before; I actually recorded a facetime call last night and the video came out just fine, with sound.
It's a very important video and I'm wondering if there's any way to recover the sound?
Thank you for any help!