I don't mean to distract from the OP's submission, but I came across "Presentify" (Show HN — https://news.ycombinator.com/item?id=22938604) and absolutely LOVE it!

Outside of my regular consulting gigs, I am also a public speaker, and thanks to Covid, every conference in the US has gone virtual for 2020. So I spend a lot of time teaching online — and Presentify is absolutely a godsend. I routinely get asked by audiences on what tool I am using.

Also, super responsive creator. You should check it out.

Update — I am in NO way affiliated with the creator of Presentify — Just a happy customer