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Hi there, @spady-ods.
The settings with your sales forms might have changed. Let me help you sort this out and email estimates with a PDF attached.
Here's how to enable this setting:
Once done, you can create a test estimate to check includes the PDF.
I'm also adding these articles for additional reference about emailing and printing invoices as well as customizing form styles in QuickBooks:
Please let me know how it goes or if you have additional questions. I'm here to help you anytime. Have a lovely day!