Regarding your scroll event… I ran into this same problem. Unfortunately this isn’t possible with on iOS devices with Webflow. See topic here:
I was able to fake it though by having the main hero section above the nav bar using z-index. this way it would stay hidden on iOS and still seem to appear after you the hero section scrolls past. For desktop i still gave the nav a move into view and fadein interactions so it still has that nice reveal on everything but iOS
Hope that is making sense…