One of the cool things with Oracle VM is that Oracle offers many templates you can download from edelivery.oracle.com and import into your repository with Oracle VM Manager (OVMM). Well, since I did the same mistake that you did, that is, not reading the entire README file, I confused templates with assemblies.
Oracle VM
I struggled to connect to the console of a newly created VM. The VM was created using Oracle VM Manager (OVMM) and despite efforts to install the required packages I could not use the console button in the Manager interface.
Just a simple trick to import ISO files to the repository using Oracle VM Manager (OVMM). The import function supports imports through protocols http, https and ftp. If you want to do this in the supported way you can use a simple web server to serve the ISO files for you.
This is an old post I kept as draft 8 months before I published it…