No solution yet...at least for this method. It is my understanding that the Arc 10.3 release has the ability to upload multipatches to web scenes???? I still have 10.2. and so wanted to use my CityEngine web scene in the Story Map Journal instead of the ArcGIS online web scene.
I replaced the URL to a ArcOnline web scene with a URL to my CE web scene in the Story Map Journal Builder . The CE web viewer shows up fine with the Story Banner in the correct place...but it has the layer window, the blue header, info, comments, and all that extra stuff....I wanted to use just the view window.
The story journal was/is going to be a tour of biking trails in the Middle Tennessee area (a lot of which are off-road trails that are not represented well on our other maps and sites). I wanted it to be completely 3D in that model trail marker, trees, bikers, buildings, water shader, streets, parks, etc....were all 3D. The journal banner would include videos of off road bikers on a certain trail, or images and info about the bikeway, park, or whatever the case may be.