How can I email both an Invoice and a Statement to a customer at the same emailing?

Hello there, @communityoil, 

The customer statement shows your summary of invoices. With this, we're currently unable to send both an invoice and a statement to a customer in the same email. As an alternative, you can save the two forms as PDF and send them from your email account. 

I know this feature would be very beneficial to your business. I'll take note of it as a product suggestion, and I'll personally send it to our product developers. I'd suggest checking out this link: https://quickbooks.intuit.com/uk/blog/. This website covers some useful contents about the program and its latest headlines. 

Please know that I'm just a comment away if you need anything else. Have a good day, @communityoil.