I am working on a magazine with hundreds of PDF advertisements as links. On the cover page, certain ads (5-10 per week) are highlighted with a call-out and their page number. The tricky thing is, as the magazine is edited, these ads (PDFs) shift to different pages. I'm looking to create a cross reference link to the linked PDF files. Do I need to group a text anchor the object (ad)? Can I create a cross reference directly to a linked object?