Is there a way to add a fade/cross dissolve transition animation between different pages within the same project?
Not easily, and definitely not from within BSS. You can fade a page out to black and then another in, but crossfading is tricky because you’d need to load the page and cache it before executing the fade. The only web builder I’ve ever seen that does this is Wix, and it no doubt has to do with their way of generating their pages via javascript. I’d recommend starting here…