OVA is a virtual appliance, ready to run on a hypervisor. With an OVA file, you can import the image into VirtualBox, VMWare, etc and all needed information is loaded from the file and you can start the VM. This works as long as your hypervisor is capable of reading an OVA file. Proxmox does not understand OVA, and you cannot use the image out of the box. Reading the provided VM definition is not possible. As an OVA file contains the VM disk, you can add the disk to a VM.
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