Thanks for bringing your question forward here in the Community. I want to make sure you're able to use the receipt snap feature in your QuickBooks Online mobile app.
As an initial troubleshooting step, I recommend refreshing the app to fix these types of issues. Here's how to get this done for iOS:
1. Tap Menu ☰ and click Help & Feedback. 2. Click Refresh Data. 3. To confirm, click Refresh.
If the issues persist, you may consider uninstalling and reinstalling the app as well.