I can see the need to have this option for your business. I'll guide you on how you can send a request, Info24.
You can send feedback to let our product team know how this is a useful feature for your company. To do so, follow the steps below:
- Go to the Gear icon, then Feedback.
- Enter your comments or product suggestions. Then click Next to submit feedback.
This goes to our Product Development team to help improve your experience in QuickBooks Online. You can track feature requests through the QuickBooks Online Feature Requests website.
In the meantime, you can continue manually sending the attachment to your customer each time you send an estimate.
Moreover, once you convert estimates to invoices, learn how you can record sales transactions in multiple ways. Go through this article for more details: Record Invoice Payments in QuickBooks Online.
Put your comment on the reply below if you have any questions about emailing estimates. The Community is always here to address all your concerns.