I appreciate you taking the time to post here in the Community, DarcieADG. I'd be glad to share information about the feature in the QuickBooks Mobile App.
QuickBooks Online app and QuickBooks Online on a desktop are the same software with different benefits and works differently with some features. QuickBooks Mobile App has a basic feature.
For now, I recommend utilizing a mobile web browser to approve bills in QuickBooks.
Please see this article to know what features are available in the QuickBooks mobile app: Compare mobile app features.
If there's anything else that I can do to help, just let me know by adding a comment below. Have a good one.
