If you are trying to take a photo and all that comes up is a black box:

You need to change your iPad settings to allow Smart Flow access to your camera.  Open the iPad settings and, from the column on the left, scroll down and select Smart Flow.  Then, on the right hand side, you can change the permissions for the app.  Make sure that the knob for camera is "On" (that is that the green part is visible).

Now when you go back into Smart Flow, you should be able to take photos with the app.