If I upload a local KML file to my portal (10.6.1) and then load it in the MapViewer, all placemarks whose icons cannot be found (for instance if the source KML file references local drive icons for placemarks) are given a default placemark a la
https://myportalurl/gis/sharing/kml?cache=kml/randomstringofcharacters. It looks like the attached image.
This default image must be from somewhere, and I'm curious how I can change it. I tried finding it in the arcgisportal folder on my server to no avail. Does anyone know how I can change this default png so KML layers with unreachable placemark icons can be changed to something other than a big red x?