Does any one know why I can’t send my invoices from the app. When I send invoice it just send me out of the app

The QuickBooks system may occasionally exhibit unusual behavior due to synchronization or latency issues, which is a possible cause of your app's damaged data, Stuart. Clearing the application's data can be an effective solution to troubleshoot these errors. Here are the steps to take:

For Android:

1. From the Menu, tap More options ⋮.
2. Hit Settings and Refresh Data. 
3. After that, select Yes to confirm. 

Once done, try sending invoices again. If the issue persists, uninstall and reinstall the app. 

If you're using the iOS version, I recommend contacting our live support team. Our representative has the tools to check your account, find the cause of the invoice issue, and provide a resolution.

Check this article to learn how to send invoices, track payments, and manage your cash flow on the go: Manage invoices and payments with the QuickBooks mobile app.

If you have more questions about invoices in QBO, don't hesitate to respond or post in this forum.