3D Scene Video
3D Scene video is in https://gccollab.ca/file/view/2463045/encreate-and-share-a-3d-scene-in-arcgis-pro-and-portalfr . The script is attached to the Powerpoint.
The video shows how to create a 3D Scene in ArcGIS Pro, with ArcGIS Pro Basic use license and 3D Analyst extension, using data in a fileGDB, and then publish this 3D Scene to Portal. Note the data has different coordinate system from web scene in Portal, so creating a local scene is required.
Reference: https://pro.arcgis.com/en/pro-app/help/sharing/overview/author-and-share-a-local-scene.htm