Files are charged the first time they are opened by a user. The charge and invoice for the case will be sent out at the same time.
The billing contact(s) at your firm will receive an invoice and receipt to their email addresses each time a charge comes through.
It's also possible to view a list of invoices from within Estateably. To do this:
Click on the Admin Console (gear icon in the top-right of the screen).
Select "Billing Management" in the left-hand side menu.
Scroll down to the "Payment History" section. You will see a list of invoices, and can click the link to view details.