Thank you for providing more information. I think I've found what the problem is.
Apple made some changes to iOS a short time ago and it's broken RenPy on mobiles using it. A fix is pending from the RenPy devs (RenPy 7.5) but there isn't a release date for the stable version yet. As soon as this update is available I'll be rolling out a fix.
Sorry that your issues couldn't be resolved just yet, and thank you for your patience.
Edit: A friend working w/ iOS environments says that Firefox browser may still work. Recommend giving it a try as well. Cheers.