Why did QuickBooks stop attaching PDFs of my invoices to my emails?

Same here.  No invoice attached to email.  Mine started last night.  

This answer on another post will be helpful for you IDK why the system changed all of a sudden. 

https://quickbooks.intuit.com/learn-support/en-us/reports-and-accounting/i-send-my-invoices-as-a-pdf...

Hello, @laurielarusso.

Let me help you isolate this unexpected behavior when sending your invoices. 

First, let's make sure your account is set up properly. Here's how:

1. Go to the Gear icon.
2. Choose Account and Settings.
3. Hover to the Sales menu.
4. Scroll down to the Online Delivery section.
5. Make sure to mark the PDF Attached tick box.
6. Click the Save button.
7. Hit Done. 

Also, you'd want to make sure that the specific invoice template you're using is set properly. Here's how:

1. Hover to the Gear icon.
2. Select Custom form styles.
3. Choose the Emails tab.
4. Make sure to mark the PDF Attached tick box in the How your invoice appears in the emails section.
5. Click Done.

Once completed, you can try creating a sample invoice and send it to your personal email.

Get back to us here if you have other questions about emailing your invoices and other sales forms from QuickBooks. I'm always here to help.

Can you please stop doing this, @IamjuViel (Quickbooks)? It's beyond annoying.

This does not answer the question and does not help users using the Desktop version. Please pay better attention before responding.