Copy disk into ceph pool

Hi all, I am new to Proxmox, and working on a proof of concept setup. I've set up a couple servers, and ceph. I am working on test-migrating a VM from Virtuozzo to Proxmox.

Is there a way to copy the disk image into the ceph/rbd pool?

I can create a cephfs and access it to copy files there.

However if I create a VM I am only offered the pool or local as storage, but not cephfs.

I feel like I am missing something so would appreciate a pointer, thanks.