I am trying to upload an mxd document through ArcGIS for Server's upload REST end point (http://SERVERNAME/arcgis/admin/uploads/upload), and the response is that Items with that extension is not supported.
I did some reading, and came across the system properties that allows you to override the default file extension white list. After using the end point to update the property/properties (http://SERVERNAME/arcgis/admin/system/properties/update) with the following json
I attempted the same with a prj file, which failed as well.
What is strange is that I can upload a zip file with no issues, even though it does not appear in the white list
I restarted the server, with no success. Any idea what is going wrong with AGS?