Hey, guys!
The prototype is looking great, I did some testing (macOS with Chrome) and here's what I think about it.

• Selecting text (with the keyboard) doesn't bring up the toolbar on macOS with Chrome — it appears when I click or click-drag-select.

• Selecting the text on Andriod with Chrome gives you the option of copy/paste and the toolbar kinda gets stays hidden behind it.

• When I Select-All and delete everything, the text becomes weirder.

• When I want to align the text, toolbar appears and the align icons are hidden behind it.

• I was not able to align the text. I think the align controls should be kept in the same toolbar instead of having the user go through three different ones?

• Image handling is pretty intuitive!

That's all for now :)