The popup can be users used to create a snapshot and add it to any collection where they have been given by a user with permission as a collection contributor.
Once a snapshot is created the popup will display
the date the last snapshot created
the user who created the snapshot
the list of collections the snapshot has been added to
If the user does not have contributor permission for any collection linked to the space, the Choose collections drop-down menu will be empty and a snapshot cannot be created.
A collection contributor can use the popup to create a new snapshot version of the document using the Re-snap button. The updated snapshot version will be added to the listed collections. Additional collections to add the snapshot can be chosen from the dropdown menu before using the Re-snap button.