How to have a hyperlink pop up from a cross-reference when the hand pointer is hovering over it?

I have a map that I created in Illustrator and placed in my indesign document. I want each location on the map to link to specific content in the document. So far, cross references seems to be the best option (rather than hyperlinks) because the pagination may change. So I am linking to specific text using Paragraph styles.  But when I export to PDF, the link works but there is no pop-up when you hover over the area. The pointer changes to a hand so if you're looking closely, you can see it's a link, but I want the label to appear that indicates it's a link. I included Alternate Text when I created the cross-reference, which is what I thought would appear. Instead nothing appears.

I've attached the indesign file and the pdf. The map is on page 7. The only links I've entered so far are to Lincoln and Frankford High schools, in the northeast quadrant of the map. FYI, I made the links 0% opacity for design reasons, but that doesn't affect the no pop-up issue as I tested it at 100% opacity.

I've also attached a screenshot showing the export options.