Here's how to replace (swap) and existing panorama with a new one, without having to recreate all the metadata.
- Upload a new pano. Name it something obvious e.g. "the updated pano"
- Edit the existing pano.
- Go to the 3rd tab "other"
- Scroll down to "swap image" and find "the updated pano" on that list.
- Click save.
Your panorama is now replaced. Be sure to go and delete "the updated pano" (which now has the original pano - they've been swapped) so you don't get confused later on.
Keep in mind: Once you swap a panorama, it will have to be reviewed again by our review team.