I used the tabbed story map template to create a story map hosted on ArcGIS Online. To enable a coworker to edit the app, I changed ownership to him (I am the administrator). Since I have done that, the "configure app" button is missing - neither him nor I have the button. It doesn't come back if I take ownership back, either. The same time, I also gave my coworker ownership of a gallery app and we are both still able to configure that app.
1) What happened to the "configure app" button? Is the missing "configure app" button an unresolved bug, or is there something I'm missing?
2) What is the best way to enable more than one person to edit a web app. Do I need to change the ownership? (I did make it part of a group, but it didn't appear that my coworker, also part of that group, could edit it without being the owner. His organization role is set as "publisher".)