I am wanting to append data from one hosted feature layer to another, and automate this process using Notebooks. I can manually do this by exporting the source hosted feature layer, downloading and then Updating the target hosted feature layer. However, this seems to be a very long way around and overly complicated if one is looking to automate the process.
Thanks a lot for responding. The users who I want to run the script do not have ArcGIS Pro so they need to be able to run solely in the AGOL notebook environment. I did solve the issue though using the edit_features command.