I created an app, it receives the verification and answers it. When I test it with dropbox-hook.py (https://blogs.dropbox.com/developers/2014/05/dropbox_hook-py-a-tool-for-testing-your-webhooks/)
it gets the message and answers it. But it does not receive any notifications when I upload or delete a file in my dropbox. I guess it is some configuration error. How can I ensure that notifications are sent?