In anticipation of its annual Prime Day event on July 16th and 17th, Amazon is offering a $20 credit to certain customers. To qualify for the credit, Prime members who’ve never used Amazon Photos need to upload at least one photo through the Amazon Photos app by July 12th. The offer is meant to encourage users to try the Amazon Photo app, which provides free unlimited photo storage and up to 5GB of video storage, with paid options for more storage. The credit can only be used for purchases on Amazon.com or Amazon Digital Services, with a minimum purchase requirement of $30, and it expires at the end of Prime Day on July 17th.