I appreciate you for letting us know, ccm5. Let me help you rectify your concern when PDF attachments aren't added automatically to your invoices.

I can see how inconvenient it is for you while working with QuickBooks. We can consider performing some troubleshooting steps to help us identify what's causing this unusual behavior. To begin, you'll need to access your account in a private browser. Doing this allows the program to run without storing cache files that can cause problems when running intuit sites. You may use these keyboard shortcuts:

• For Google Chrome browser: Ctrl + Shift + N
• For Mozilla Firefox browser: Ctrl + Shift + P
• For Safari browser: Command + Shift + N

If your QuickBooks runs smoothly from there, you may return to your default browser and clear its cache or use a different supported browser.

Moreover, I'm sharing this article to guide you to enter invoices when customer plans to pay you in the future: Record invoice payments in QuickBooks Online.

Let us know in the comments below if you have additional questions or other QuickBooks concerns. We'll gladly assist you further. Keep safe.