I have a few devices and would love to play a vault across them as the cloud feature claims. I can't see any UI for cloud storage setup. How does it work? How do I identify myself across devices? Where do I turn it on?

What devices do you have?

I would also like to know because I tried following the steps on the website and they do not work.

The steps are to select cloud sharing in the slot of the corresponding save slot and it will give an error and ask if you want to load the save.