Cannot preview my invoices on the QuickBooks small business App , started playing up yesterday , have deleted and reinstalled but no joy

I'm here to assist you in effectively previewing your created invoices after implementing my recommendations, @cardy71. I'll provide further details and troubleshooting tips below.

If you are using your QuickBooks Online (QBO) mobile app on an iOS device, know that we have received similar inquiries regarding this. I recommend contacting our Live Support team for comprehensive assistance to examine this matter. They have the expertise and necessary resources to help you.

To contact us, here's how:
 

1. Inside QuickBooks Online, navigate to the Menu button.
2. Select the Help option.
3. Choose the Ask QB assistant a question.
4. Enter "Contact Support" and click Contact a Human.
5. Follow the prompts, then choose a way to connect with us.

If you're using an Android device, you can update your data to enhance your app's performance without removing any documents. This update will aid in managing your business tasks on QBO more efficiently. Here are the steps to follow:
 

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

Additionally, you can also preview your invoices before sending them to your clients using any supported browser.

Furthermore, consider sending a customer statement as a reminder for customers with outstanding balances or upcoming invoice due dates.

Refer back to this thread for any concerns you may encounter. If you have additional questions about managing invoices or need assistance in the future, let me know. I am here to guide you through each step of the process.