[ovirt-users] Add disk to HostedEngine

My installation is a hosted-engine deployment with a host and the Engine VM running on it, version 3.6.4 of oVirt.  I attempted to add a disk to my Engine VM but am getting  the error "Cannot add Virtual Machine Disk.  This VM is not managed by the Engine".  I can add disks to a test VM I created. So how do I add another disk to the Engine VM?  Thanks.