The Arttu application can be used to use digital content (videos, audio, 3D animations, online content) related to Sanoma Pro's printed textbooks. Here's how to use Arttu: - Open the application and allow it to use the device camera - select the desired book in the My Books menu via the plus button - Let the app identify pages in your book that contain digital content - open the selected content from the button that appears on the screen Operating system requirements: Android 6.0 or later. We ask users to report problems with the app using its feedback feature.