Thank you for the suggestioins. The log simply mentions that the web adaptor has been configured. There is no entry related to clicking on the rest endpoint URL. I reran the Server Account utility as well. Still no improvement.
i tried making two ArcGIS Server Connections in ArcCatalog, one with the 6080 specified, and one assuming the web adaptor (the "6080" is inserted automatically though. In each case, when I open the properties for the included sample service, the logs then report that uploaded content was not found. The service is previewable in ArcCatalog and the properties are actually displayed in dialog box.