No generate invoice number when do new invoices after Updated on Android App.

Hi there, corado. Thanks for bringing your concern to the QuickBooks Community page.

Allow me to share some troubleshooting steps to fix your invoice concern in the QuickBooks Online (QBO) mobile app. To start, let's refresh your application to check if the problem is related to a minor data issue.

Here's how:
 

1. Go to Menu ☰, then tap More Options ⋮.
2. Select Settings, then Refresh Data.
3. Tap YES to confirm.

Doing this will free up the storage without deleting your app's documents and data. If you're still getting the same results, I recommend uninstalling and reinstalling your QBO mobile app.

Furthermore, you may refer to this article if you want to customize and make quick changes to invoice templates while on the go: Customize invoices on the QuickBooks Online mobile app.

Please don't hesitate to go back to this thread if you have additional concerns about managing invoices in the QBO mobile app. I'll be here to help you out. Take care.