vRA 7 You could clone from machines, they did not have to be templates. Is that possible in vRA 8? I have not found a way to do it, so I figured I'd ask here. I tried changing ImageRef value after the request but that still won't work.
we can either clone from template or ova
if you want to see how imageref work , below is the example , where my vCenter has access to this repo and it will download the ova on the fly .
Are you talking about clonefrom Snapshot option ?