How to add multiple attachments to one email

I hope anyone can help me with this simple problem I have with Dell Boomi.

I have an integration flow where I get several documents from an instance. I want those documents mailed to my email adress. But now I get 8 mails, with 8 documents. What I want is one mail, with 8 documents attached. It seems so easy but I can not find this in Boomi, or elsewhere