I'm trying to upload a photos to a story map tour that I am making. When I go to Change the photo it won't upload and I am stuck with the default ESRI "No picture available" photo. This was originally created form a .CSV taht I uploded as a hosted feature Layer. I want to host the photos in the story map tour so I left the columns "pic_url" and "thum_url" blank. Could this be the issue?