Test your app camera Learn how to test your app camera using image injection, so you can ensure end-users can take photos or scan QR codes with your app. Before you start You’ll need to enable Instrument application for camera injection when installing your app before you can test your in-app camera. Add an image to the library To add an image to your injection library, select Image Injection, Set Simulated Image, then choose one or more .jpg, .jpeg, or .png files from your computer. Remove an image from the library To remove an image from your injection library, select the x icon in the corner of an image. Inject an image To inject an image into your app, launch the app and open the in-app camera. Choose an image from the library, then select Inject. When you’re finished, select Reset Camera to stop image injection.