New to Zoho Writer - Not getting very far

New to Zoho Writer - Not getting very far

I downloaded a one-page document for two classmates to add their own comments to it.  When logged in, I can see that another user is "viewing" the document based on the little cue that appears in the lower right. But, am I supposed to be able to see my classmate's additions as they are entered? Does she have to resend the document once she's done?  So far, neither of us has been able to see an updated version containing the other person's comments.

Like, why is this happening?  Is it as simple as someone forgetting to Save?

Please help.