I see how important having a feature that allows easy scanning of invoices in QuickBooks Online (QBO), @tyresales.
Scanning any sales transaction is currently unavailable in QBO. In the meantime, you can utilize other third-party applications to achieve and help you seamlessly link scanned invoices.
You can visit the marketplace to find the app or log in to your QBO account, navigate to the Apps menu and Find Apps, then use the search field provided to find an app suitable for you.
Furthermore, you can visit this article to learn more about personalizing your sales forms in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Keep us posted if you have other questions about managing invoice concerns. I'll be around to help. Stay safe.