Welcome to the Community space, @dreedy.
Let me provide you with the steps for sending your invoices as an email with a PDF attached in QuickBooks Online (QBO).
You can add a PDF attachment when sending your invoice using the Custom form styles feature in QBO. Here's how:
- Go to the Gear icon, then choose Custom form style.

- Click New style and select Invoice.

- Enter a name for your invoice template.
- Select on Emails and tick on the PDF Attached checkbox.
- You can also customize other details if needed.
- Once finished, click Done.

Now, let's customize your recurring invoices using the template we created. Follow the steps below:
- Go to the Gear icon and click Recurring transactions.

- Choose a recurring invoice, then click Edit under the Action column.

- Scroll down and click Customize.
- Choose the custom style you created, then hit Save template.

Moreover, I'm adding this helpful article as your reference in personalizing your other sales forms in QuickBooks Online: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Return to this post if you have other concerns about sending and customizing your invoices in QuickBooks Online. I'll be here to lend a hand any time.
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