Copy to a location on the Proxmox system (i.e. a network share or /root)
cd to the directory the ova is in
# Extract zip it came inunzip GNS3*.zip
# Resulting file in my case was called `GNS3 VM.ova' (with a space in the name!)# Extract OVA (this is itself a zip)tar -xvf 'GNS3 VM.ova'# Import to VM ID 590 in Proxmox (just an example)
qm importovf 590"GNS3 VM.ovf" local-zfs