navigating endnotes in iPad version

I am using the iPad version of Acrobat for reading and annotating PDFs. I notice that the navigation function works in one direction for endnotes within a document: from endnote link (superscript number) in the body text to the endnote location at the end of the document. However, unlike in almost every other reader I have tried, this link does not work in the reverse direction. There is no way to get back to the source by cliciking back on the endnote number. Furthermore, there does not seem to be a "back" or "return to origin" button in this reader. This seems like a major (even catastrophic) design flaw. So much so that I assume I am missing something obvious. But, after 45 minutes with Adobe tech suppor this morning, I was directed to post the issue here. I'll be grateful for any suggestions that anyone can offer.