When I add the layer list to the user interface the ground elevation layers are not visible in this list. In the webscene, I have added them to the layer list. With several ground layers, it is possible for users to see differences between as is and as built
In a story map I have added several instant apps but now I also have to add the web scene to the storymap, which may confuse users or a client.
Webscene: Ground layers selectable
3D Viewer: Ground layers not selectable
Sorry I missed this one until now. I'll take a look and see if we can add support for this in the next release of ArcGIS Online.