From the feature layer's page in your Contents, click Update Data.
Manage hosted feature layers—ArcGIS Online Help | Documentation
What is this using the ArGIS API for Python? Similar to updating a csv... but with a HFS and .shp zip file (zip hosted in AGO notebook)
item.update({}, csv_file)
Hi @TL2 have you read the documentation on this method here? https://developers.arcgis.com/python/latest/api-reference/arcgis.gis.toc.html#arcgis.gis.Item.update