Unfortunately as of April 26th, 2016, Dropbox will terminate the service Digital Auto Guides uses to synchronize your data between devices and to back-up your data in case a mobile device is damaged. We found the Dropbox feature to be invaluable and are very upset that Dropbox has decided to terminate this valuable service.
We are currently looking for alternatives and hope to have another solution available in the future. For now you will only be able to store your settings and changes on your mobile devices uniquely. This means that if you enter data such as fuel consumed on one device, that fuel consumption would not automatically appear on the other device. For this reason we recommend that until we have an alternative to Dropbox, you only use one device for your Digital Auto Guides use.