I have downloaded the developer application for the story map template. I would like to customize it to do 2 things. First, I would like to be able to show 2 pictures per location and add some sort of toggle button or tab control to switch between the 2. Second, I would like to some how store a unique extent for each location. I was thinking of modifying the csv file to store a url of an extra picture and also store the extent of the location. I would then modify the downloaded template to read the updated csv file. I don't know where to start to do this or if it is even possible.