I set up a story map, and included some additional layers. I re-ordered the pictures, however the application does not recognize those changes.
Highlight your project in AppStudio for ArcGIS (BETA). Select the cog icon to open the Settings Tool. Browse to Properties tab of the Settings Tool. The properties that control the order of your photos are:
For more information, see: Configure Map Tour—AppStudio for ArcGIS Desktop Edition (Beta) | ArcGIS