Our Doodle apps can be used with or without a data connection, but if you are switching between multiple devices we recommend using with a WiFi connection.
If a user Doodles offline, the work saves locally on the device. This means they will need to keep using the same device until they have internet connection. They must login on this same device with internet connection in order for the work to save to the server. Once this has been done, they can then switch to a different device.