Once you install Amazon Photos - Cloud Drive and set it up (it comes with a default configuration), the app will sync all the photos you take. It stores them in your Amazon cloud account, so you can access them via any device or computer with an Internet connection.
Some of the options include the ability to sync photos only when you have WiFi, or automatically organize them into different albums.
Amazon Photos - Cloud Drive is an excellent alternative to Google Drive and other photo-syncing apps. It has a large storage capacity and some great features.