Locate iframes onto a map?


I am doing a project with students that will involve their recreating some historic photographs. We will catalog both the old and new images in Omeka as items, and then create a slider with Juxtapose. I had hoped for the last step to be for them to embed the sliders onto a map, so they would appear on popup pins, but it doesn’t seem that iframes can be entered into Omeka as items in their own right. Any suggestions welcome. Thanks in advance.