Once you have run Ski Tracks on your Casio Wear watch select the Ski Day and press the Upload button.
You will be shown a random 6 digit pair code.
On you Android Ski Tracks App
Select Settings -> Paired Devices
Now press the + button and Enter the Pair Code shown on the watch.
The Watch should now appear on the the list of Paired devices.
Once uploaded (which may take a few minutes) select the History and pull down to sync down the uploaded Ski Day.