Report an issue with the app. Using QuickBooks app on Google Pixel 6 Pro. Try to enter payment information on an invoice. It just says "saving" but never completes.

Let's perform some troubleshooting steps to enter your payment information on an invoice in your QuickBooks app, 

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We can clear the app's cache files to refresh the application. Here’s what you need to do:

1. Log in to your account.
2. Go to the Help menu at the top of the screen.
3. Choose the Rest App Data option on the drop-down selection.

Then, try entering the payment information on the invoice again. Here's an article you can refer to for  receiving an invoice payment and editing an invoice payment using the QuickBooks Online mobile app. If you get the same result, uninstall the QuickBooks App by following the steps below: 

1. Open the Settings of your phone.
2. Select the Storage heading to open its settings page.
3. Click Other Apps to see a list of your installed apps.
4. Find the QuickBooks mobile application and tap its listing.
5. Select Uninstall.
6. You can go to Google Play to re-download the app.

For iOS:

1. Go to Settings.
2. Select General.
3. Click iPhone Storage/iPad Storage.
4. At the bottom of the screen, you'll see your apps arranged by the amount of storage they take up. Select the QuickBooks mobile application 
5. Tap Delete App, and then confirm the changes.
6. Head to the App Store and re-download it.

Here's an article you can refer to for the steps and details on reinstalling the QuickBooks Online app. This helps us ensure you get the most recent version of the application. Feel free to visit our Help article page for more insight about managing your business in QuickBooks.

I want to make sure everything is taken care of for you, please let me know how it goes or if you have any other issues or concerns. Just leave a comment below and I'll get back to you. Take care always.