Despite following the guidance I have been unable to update existing features using Append data to layer from the Updata data button. I have tested this with multiple hosted feature layers, each with a unique ID field defined (see screenshot) . I have tried appending from csv, xlsx and zipped shapefiles but in all cases, the update existing features option is greyed out (see attached screenshot). The guidance suggests that the enable sync option has to be disabled, which it is. The fields also match exactly. Can anyone give ideas as to why I am unable to use this tool as intended?