ArcGIS online add layer to Scene

[PaulaLopez]

I have a feature layer in my content of ArcGIS Online and I want to add it to a Scene in Scene Viewer. When I try to add the layers my content seems empty. I am working with a free ArcGIS account. Does anyone know what may be the problem? 

Thank you!

[RussRoberts]

I am guessing that feature layer is considered a feature collection (Map notes, uploaded shapefiles or CSVs - not published are examples of this type). This type of feature layer is not supported in scenes. Feature layers backed by a feature service are supported.