We've improved the drone picture-taking tutorial. Please try it again.
When you try to fetch a picture from a drone over bluetooth, it can take 10 seconds per picture. Sometimes it may take a minute even. If you stop the program or turn off the drone in the meantime, it appears to not be working. In our new drone tutorial, you should see some more information and a progress bar as the picture is being transferred. Please give that a try and let us know how it goes.