To give you some insights, the Free Flight mission worked because it does not require to upload a mission (waypoints) to the drone before starting the automated image acquisition. On contrary, Free Flight operates without waypoints and solely relies on the current position of the drone in order to trigger the images.
We do not expect the same warning on iOS version and I believe that you will be able to fly it without any issues.
As mentioned, we are investigating the case and we will post updates in the “mission cannot be started because of dji internal failure”.