I have created a model for closest facility analysis. Now I would like to add an iterator to it. Specifically, I need to iterate through 448 "Incidents" (the closest facility model is structured so that it solves from incidents to facilities). Each of the incidents is stored as a shapefile in a folder (one feature per shapefile). So, I would use the "Files" iterator, presumably. But not sure how. Below is a screenshot of the model as currently constructed.