Site Audit Pro needs access to your photos and/or camera to be able to add a photo to an issue. If it doesn't have access you'll see a blank screen where your albums should be when trying to add a photo, or a black screen when using the camera. To ensure the correct permissions are set:
1) Go to your global device Settings.
2) Tap on "Privacy" section, then select "Photos" or "Camera", depending on which you require.
3) You will then see a list of Apps on your device that have requested access to your photos/camera. Please ensure the switch for Site Audit Pro is set to on.