Hello there, @SophiaGTP. Here's an additional step to fix any QuickBooks Online app (QBO) errors you're currently experiencing.

I understand the importance of resolving this to manage your business tasks within QBO. The cache data can become full and may affect the way we work with QuickBooks. In resolving this, you may troubleshoot any app-related issues to fix any cached data that seems to be causing the problem on your mobile app. Follow the steps below on how.

1. Change the Wi-Fi data connection on your device to 4G (this varies by device).
2. Close and restart the app.
3. Here's how to clear app data:
   1. Open your device's Settings.
   2. Select Apps.
   3. From the list, choose the QuickBooks app and select Storage.
   4. Click Clear data.
4. Power down and restart your device.

If you are still experiencing the issue, I suggest uninstalling the QBO app from your device and reinstalling it. This process will ensure you have the latest version of the QBO app installed to resolve any errors.

On the other hand, you may also visit this link for additional knowledge about personalizing your invoices in QBO: Customize invoices on the QuickBooks Online mobile app.

For more questions about managing invoices or any QuickBooks-related concerns, let me know by replying below. I'm more than happy to help. Keep safe!