Select Amazon Prime members can get a $10 Amazon credit when they upload a photo for the first time to the Amazon Photos app. Amazon is hoping that more customers try their Amazon Photos backup and storage service, which gives unlimited photo storage to Prime Members (plus 5 GB of video storage).
The $10 promotional credit can be used on an order of $25 or more on Amazon, and must be used before December 31st. Check out the promotion at Amazon to see if you are eligible.