Export OVA to Proxmox
Upload .ova file to proxmox server
root@pve:/Mirror1/csr/backups/OVAs# tar -xvf SMGR-10.2.0.0.439670-e70-46E.ova
SMGR-10.2.0.0.439670-e70-46E.ovf
SMGR-10.2.0.0.439670-e70-46E.mf
SMGR-10.2.0.0.439670-e70-46E.cert
SMGR-10.2.0.0.439670-e70-46E-disk1.vmdk
Run the import tool
qm importovf 1001 SMGR-10.2.0.0.439670-e70-46E.ovf backups --format raw
Importovf tool where 1001 is the VM number backups is the destination of the drive in raw format.