I'm trying to create a copy of a droplet by restoring a snapshot to a different droplet, but no other droplet can see the snapshot. The new droplet is in NY and the snapshot was made in SF, but I transferred it and none of the other SF droplets can see it either. The documentation says that there's a way to make the snapshot "globally accessible", but that option isn't listed in the transfer dropdown, only the individual data centers. What do I do????