I'm working on a spyglass story map similar to the new york one http://story.maps.arcgis.com/apps/StorytellingSwipe/index.html?appid=97ae55e015774b7ea89fd0a52ca551c2&webmap=60a6d8d2ab754250918e7fc21d7ac999 . I have been having trouble adding the picture of the old map as a layer. Does anyone know what kind of file they used, or how i could add it? Any help would be appreciated!
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