The hyperlinks that have worked for months in the one PDF document I have on my iPhone 6s with current OS stopped working when Reader updated itself a couple of weeks ago to 18.09.14. The hyperlinks in this PDF document are all internal. Meaning tapping a link is supposed to take me to another page within the same document. The hyperlinks are images. Tap on an image and go to another page in the document. As of the Reader update, tapping on an image just toggles the view mode between full-screen and regular.