Multiple Downloads Of Same Image - Green Screen

Hi Tim, some clients using our green screen feature are wondering if they can buy extra downloads of the same image but with a different background.

In my collections, they get the warning that they have already bought that image.  Is there a way to do this?

They can, it was added in the 4.8 update.

• Made it so greenscreen photos can be added multiple times as a download to a collection as long as a different background is selected. 

I must be an idiot, but I can't figure out how to make it work.  You probably hate me by now :(  Is there a setting to change somewhere?

I even tried it on your green screen demo site but I can't find a collection with a download to try it on.  The cart lets me add downloads repeatedly whether I change the background or not, but that's not quite the same feature.

Is there a setting I'm missing?  Does it not work on QR passcode galleries?

Screen shot attached, the 2nd background is selected with the same first photo but it's not allowing it.

If it's a print product I can use the "Add extra photos" button but not for a download.

Just for reference, here's the settings in the collection: