First you need to establish a connection to the SeeYou Cloud. You only have to do this once.
A flight will be uploaded to the SeeYou Cloud automatically if the checkbox "Upload flight after landing" is checked in Menu > Settings > Oudie Live > SeeYou Cloud:
You can upload a flight to the SeeYou Cloud manually as well. In order to do that go to Menu > Next > Logbook page.
On the logbook page select the flight you wish to upload then press the "Tools" button in the menu at the bottom of the screen. You get to choose an action. Choose "Upload to SeeYou Cloud".
That's it. The flight will upload. As soon as it is uploaded it is available for opening in SeeYou and other apps. If it is a large upload you can see the upload progress on the screen of the Oudie Live app on your phone.