Hi userinfo8!
I also like the idea of sending statements using the mobile app. However, this is only available when using a browser. You can access your QBO account using a mobile browser, so you can send statements. Open this link in a browser to log in: https://c11.qbo.intuit.com/qbo11/login?webredir
You can also check about creating and sending statements for your additional information.
If you have more questions about features or anything about QuickBooks, feel free to comment below. Take care always!