When creating a News Story, there is an option to add existing photos. However, when I do this, the photos are not displaying on the News Detail Page.
On a News Detail page, there is a block called News Detail Photos. This pulls in photos that are uploaded from a computer and attached to that particular story. In order to have an existing photo display on a News Detail page, you need to add a photos content type to the page and change the drop-down menu to "Display Attached Photos (no category)".