You are sharing a web scene or web layer that has extruded features. When sharing polygon layers to ArcGIS Online and ArcGIS Enterprise 10.6 and later, only the base height extrusion is supported. Either your extrusion type is not supported, or your active portal does not support extrusion and the features will be flattened.
Solutions
Do one of the following:
- Use the base height extrusion. For more information, see Extrude features to 3D symbology.
- Convert the layer to multipatch features using the ArcGIS 3D Analyst extension Layer 3D To Feature Class tool.
- Do nothing. The features will be flattened and your web scene or web layer will be shared.
Additional information
For more information, see Analyze your GIS resource.