Hi there, @brittney5.
Yes, there's an option on how to turn it off. Just uncheck the box beside PDF Attached under Online Delivery. I'll show you how:
- Go to the Gear icon.
- Select Account and Settings under Your Company.
- Select Sales under the Account and Settings window.
- Click the Online Delivery pencil icon.
- You unchecked the box beside PDF Attached and select an email option for invoices under Additional email options for invoices.
- Click Save.
- Click Done.
You may check this article for additional reference: Email sales forms directly to your customers from QuickBooks Online.
In case you want to add attachments to your transactions and customize them, just click these articles for reference:
I'll be right here to assist you if you have any other questions or concerns. Just leave a reply below. Take care!