In the order view, you upload documents that will be sent with the next invoice.
Click on the "Documents" tab at the bottom of the order view and add one or more documents by clicking the "Add document" button.
In the column "Included next invoice," select "Yes" from the menu. The default choice is "No."
Here, two documents have been added to be sent with the next invoice:
When sending the next invoice, both documents will be included as attachments.
The status automatically changes to "Sent" in the menu selection in the column "Included next invoice":
NOTE: The maximum combined file size including the invoice for email is set to 20MB in Onlet. This is a limitation that comes from email.
In the Communication History, you can click on the invoice Sent-status and see that both attachments were sent along with the invoice.