We have recently discovered that there is a problem reading PDFs on an iPad if the PDF is made accessible via a Web Content link. The PDFs will open but there will not be any scroll bars meaning that most of the document will be off the bottom of the screen.
The way around this is to select the “Open in new window” feature which is found behind the ‘Options’ link of the Web Content tool.
We would strongly recommend that this is always selected when the Web Content link is to a PDF with more than one page.