Numbers wont sync on icloud on macbook pro

I don't have anything specific to write, I'll just send you a picture so you can see. I don't understand what the problem is, and I'm slowly going crazy. My fiancée and I got iCloud and created a shared folder where we placed shared documents that we both work on (just like we share notes), and it keeps spinning like it's syncing... I tried saving in the Numbers folder on iCloud, and that works fine, but as soon as I share that same document with someone else, it stops working. Everything works fine on the iPhone.