Hello again, phil13.
Right now, the option to auto email imported invoices in QuickBooks Online (QBO) is currently unavailable. You'll need to send them manually.
While the feature you're looking for is unavailable, you may wish to consider looking for a third-party app. I can route you to the website where you can look for an application specific for your business needs. From there, you can integrate the app to QuickBooks Online (QBO).
Additionally, I'd encourage you to visit our QuickBooks Blog, so you'll be updated, with our latest news and updates including, product improvements. Just go to https://quickbooks.intuit.com/blog/.
On the other hand, if you have customers you invoice regularly, consider using the recurring transactions feature. You can set invoices to generate automatically and email it to your customers. For more details about this, see below articles:
If you have other questions or concerns when using QuickBooks, please let me know by adding a comment below. I'm more than happy to help. Have a great day.