Thanks for posting in the Community, @mkohler01.

The Summarized details may be selected in the template, which is why it is only showing a summarized version of the invoice. If that's the case, let's change it to Full details to see the subtotal and other necessary information.

Here's how:

1. In QuickBooks Online (QBO), go to the Gear icon at the top right to get to the Custom Form Styles. 
2. Locate the invoice template you're using, then click Edit under Action column. 
3. Proceed to the Emails tab, and select Full details. Ensure that the PDF Attached box is checked.
4. Hit Done to save. 

After that, try to send a test invoice to yourself to double-check.

Just in case, I'll add this article for future reference: Customize your invoice emails.

Please let me know if you have any other issues or concerns by leaving a comment in this thread. I'm more than willing to help. Have a wonderful weekend!