To integrate Google Analytics, go to the "Send Data" tab on the left-hand toolbox:
You will see an input for your Google Analytics tracking code. Enter your "Universal Analytics" tracking ID (which you can find here), and click Save:
Congratulations! Once published, your flow will connect through to your Google Analytics, where you can see:
To view this, take your flow ID: the randomised letters and numbers after app.upflowy.com/flows/:
Copy-paste this ID into your Google Analytics under Events > Pages. Click here for more information on Google Analytics events.
Enjoy your analytics!