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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:
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!