Add additional resources: If you'd clicked on "Tell a story," a side bar should pop up on the left hand of the screen. In that menu, you can add image, chart, audio, video, or text. The materials are added to the map, but do not layer on top. When you save this slide and view it, the map remains central and any added resources can be viewed as a lightbox slidehow for presentations. You can add as many elements as you want, all connected to the same map, so you can tell a story about that time and place as part of a longer story that involves multiple maps.
Annotate the map: You can also
add points directly to the map and annotate these points with text, image, video, chart or audio. (Like in Google Maps) To do so: in edit mode, go to the menu on the right hand side (it looks like 3 straight lines) - and select "annotate map." This menu box allows you to add points for annotations and add elements. If you choose to use this tool and add annotations to the map, make sure to change some of the "interactive" settings so that your users can click on the points you wish to annotate.
NOTE: These different modes of adding resources may work best for different audiences. The first option is best for presenting your argument to an audience - the presenter is in control and can navigate through the added elements. The second is best for interactive users so that users can explore and learn.