I'd be glad to help share information about accessing QuickBooks Online (QBO) using the mobile app.
As of now, you can only use the Expense feature to record the bill/s using the mobile app. Therefore, you can't see the bill/s recorded on your QBO account from there. To view the bills created and to record a bill in QBO, you may need to use the web version of QBO. You can open any supported browser like Google Chrome, Internet Explorer, or Mozilla Firefox, and log in to your QBO account.