Trying to understand how the sync works

So this is what i am trying to figure out.

I know that if i create a document in pages on my mac that i need to upload the doc via icould for it to show in iwork. I also know that if i access that file from my iphone or ipad and make changes to that document that it automatically updates it on icloud.

This is my question, Is there a way when i make changes to that document on my mac that it automatically updates it like my iphone and ipad does on icloud. Coz whats happening at the moment is every time i make a change to the doc on my mac its currently NOT updating it on icloud. I am doing something wrong or does it just not update the document?

Thanks for your help!