I'll add a few pieces of information about statements, Magarton.
 

We're unable to send the statements automatically. You'll have to check each client with open balances or receivables. Then, send the sales form manually.
 

Let me include this reference to help you manage customer statements: Create and send customer statements in QuickBooks Online.

If you have additional questions, feel free to click the Reply button. We'll get back to this thread as soon as we can. Keep safe!