I'm having issues with the PDF page type in xot and also when embedding on a bootstrap. The issue only seems to be with IE11 which is a pain as that is what we use. When building the page and testing in an xot the PDF displays fine for me but not other people. In bootstrap anything embedded as a PDF just doesn't appear.
I can link to a PDF without problem but wanted to avoid additional tabs opening
My install is v3.5
I haven't seen this issue before. Could you create a project with a PDF in it, make it public & then share the link with me please so I can see if I have the same problem viewing it