Hello, @pwaters.
Thanks for posting here in the Community.
Currently, we are unable to send one PDF copy of the invoice along with its images in QuickBooks Online. I suggest using third-party apps to send an invoice using PDF with images.
You can visit this site to look for applications you can integrate with QBO: apps.intuit.com.
If you have other concerns, feel free to leave a reply. I'm always here to help. Have a wonderful day!