Use Pictures from the Album

If you have previously taken a picture of your Receipt(s) from your phone camera, you can Upload them by tapping on the Album icon from the Camera screen. 

This will open your phone Camera Roll and let you select the pictures(s) to be uploaded to your Receipt Wallet. 

Once you've selected the pictures, tap Done, and you should be able to see those pictures in your Receipt Wallet. 

Learn more about the Receipt Wallet.