Setting this property to false will cause the upload portion of the upload dialog to not be rendered, causing the upload dialog to be a read-only mechanism for loading images/files into the editor window.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2