You're able to change the default images for your mobile app under Images section as showin in the following guide. Uploading Your Own Images Head over to Images section in Saturn: Click the Choose file button on the image that you want to change. Your image size must be 660 x 440 pixels. By clicking the magnifying glass icon, you can see a screenshot of where the image is placed in mobile app. Your browser does not support the video tag. Once done, click on the Save Settings.