OMG - CAN NOT EMAIL INVOICE - window to email appears then disappears without ability to email - OMFG!

Thanks for bringing this to our attention, @co-88. We can perform some troubleshooting steps so you can resume emailing invoices in QuickBooks Online (QBO), and I'll be glad to assist you.

When a browser is loaded with outdated cache, it can result in unexpected product behavior. To clear them, let's log in to your QBO account using a private browser to access the product with a fresh start. You may use these keyboard shortcuts:

• For Google Chrome browser: Ctrl + Shift + N
• For Mozilla Firefox browser: Ctrl + Shift + P
• For Safari browser: Command + Shift + N

Once resolved, return to your default browser and clear its cache and cookies to refresh the page or use a different supported browser.

Additionally, you can take advantage of the available tools in QBO to customize your sales forms. 

I'll keep this thread available whenever you have additional concerns about emailing invoices. Our team is always available around the clock to lend you a hand. Take care.