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Hello there, @kenny13.
You may check the option to attach the .pdf file to the invoice using the Custom Form Styles feature. I'd be happy to show you how to do that:
To know more about how to customize sales forms, you may check out this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.
I've also added this article for your future task about creating multiple invoices from one job or transaction for your customer: Set up and send progress invoices in QuickBooks Online.
Please don't hesitate to tag my name in the comment section below if you have other questions regarding QuickBooks. I'd be glad to help you further. Take care and have a wonderful day ahead.