By default, the Compass app will not access the iPad's Pictures or Camera Roll folders; this can be important when adding custom buttons. To allow access:
1. Press the Home button to access the iPad's Home screen.
2. Select Settings (looks like a gear in a box).
3. On the left side, scroll down to Compass. Select that.
4. Check the box next to "Allow Camera Roll and Pictures".
This should allow Compass to access these folders on the iPad.