Yeah, unfortunately, as far as I know, Safari prevents webpages from initiating fullscreen mode themselves. The only way to do it is by scrolling, and obviously, scrolling does not work in the viewer, since it is a single screen view.
Your alternatives are basically to get into full screen mode before opening the viewer, or after, using a hack like the one you discovered to enter it after opening the viewer. There may also be some button in safari's settings somewhere to trigger fullscreen mode, but I have not found one (although since I only got to try for a couple of hours when someone lent me an ipad, I may have missed it).
Last edited by kovidgoyal; 09-18-2017 at 05:30 AM.
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