Upload to the cloud icon on the Ride Report title bar

Recently I’ve noticed an icon that sometimes shows up at the top bar of the training summary screen. I’m not sure if it was always there but now that I know about it I’m super curious what it does.
I was trying to press it and it changes color to orange, but I wasn’t able to associate it to anything.

Does it appear when I lost connection to the server and my session data needs to be uploaded? Is it just an easter egg and nothing happens when you press it?