Is it possible to Add new Layers and Relationships to a Hosted Feature Service, without having to download all of the data to a File Geodatabase, building the layers and relationships in the File Geodatabase and then republishing to ArcGIS Online? Is this possible by using the "Add to Definition" function in the REST API Admin? It is problematic to download to a file geodatabase first because I have editor tracking enabled. It seems like it always changes the creator, editor, creation date and edit date fields - and it also doesn't seem to handle bringing the relationships across when downloading and using that workflow. Any way to add a new layer and relationship directly in ArcGIS Online? Thanks!