I have recently learned how to script my web layer updates using the arcpy.sharing module. This is great, as I can update my parcel data every morning. However, every time the script runs, the thumbnail on AGOL is replaced with a generic one. I have a thumbnail specified in the aprx map, but it gets overwritten unless I publish directly from Pro. Now that I am publishing my data in a data hub/open data site, this lack of a proper (custom) thumbnail matters. I don't want to have to reupload my …