I just tested #RecordScreenIO:
https://recordscreen.io/
Worked perfectly, super easy to use. I was able to choose whether to record my screen and webcam, or just the screen, and which elements of the screen to record (whole screen or particular window?). After asking the web browser for permission to use the mic. and access the screen, it recorded with my voiceover, and presented the result as an embedded video. Then I had the option to download the video, or close and try again. 10/10 #UX