Upload and attach disk image

Hello,
I'm evaluating PRoxmox, and I'm very happy with it.
I can't figure out if it is possible to upload a disk image (vmdk, qcow, raw...) from the gui, and attach to a virtual machine.
It seems that the only way is create a virtual machine with a dummy disk image, uploading manually the real disk image to the proxmox host and rename it as the dummy disk image.
Am I wrong ?
IMHO, this is a "must have" ...

Thank you !