Jess,
By the way -- great looking story!!
The cover image isn't loading for me, however. Are you trying to use an image you uploaded as an item in My Content? If so, be sure to make it public and use the URL that appears in the lower right of the item page (not a URL you copy from the browser address bar -- that will contain a token that may be invalid for others or expire). The correct URL for an image stored as an item in My Content will end with ".../data"
Alternatively, you can load images directly into your Cascade story by dropping them on the blue area of the Media Picker on the ArcGIS tab. The uploaded images will then be available in the This Story section of the ArcGIS tab.
Owen
Owen Evans
Lead Product Engineer | StoryMaps