Here's a weird one for you. When viewing a PO using command PDF!, PO is opened in Adobe X. We then try to save the PO to our SharePoint. Everything behaves normally but the PO does not get saved in SP site. We can save the PO top desktop, open it in Adobe X and save it to SP and it works. Can save PO to anywhere else on network or locally using PDF!, but just not to any SharePoint site.