How do I send estimated in QBO using my gmail account?

Hello, @andysuave.

Yes, the ability to send forms within QuickBooks using your Gmail account is only available for invoices. As of this time, you'd want to download the forms. Then, send it to your customers using your desired email provider. 

I can see how beneficial this feature for you and your business. I'd personally forward this to our product engineers for consideration.

Also, you can visit our blog so you'll be able to get the latest news about QuickBooks and what our Product Care Team is working on. 

Feel free to leave a post below if you have other questions about sending sales forms within QuickBooks.