Hi, everybody,
It is Jaco, a newbie here.
After to install Sigil all was right. But I found a problem. If I include a cover using Tools/to add cover to a epub3, it makes a code that doesn't work with Adobe Digital Editions neither other visors. Cover dissapear or it shows tiny.
I spent 2 days working and asking in Telegram groups of CSS/HTML. Nobody undestood the problem, nobody had a solution. Finally I get the solution here,
https://ebookflightdeck.com/handbook/coverimage
I hope it helps to another people.
Best,