Great tips! I created a temp folder @ Documents/Sigil_temp, and it was populated as soon as I modified an ePub and saved it. I have Sigil 0.9.8, by the way.
I should spend some more time getting familiar with Calibre, but I'm used to Sigil, which I find amazingly easy to use in general. I'm still trying to figure out why anyone would use InDesign. I got it for free since I have an Adobe subscription, but when I saw the difference between InDesign and Sigil, I just about had a heart attack.
