The app is just a portal to the online browser version so you can go back and forth. I don't know about importing to the app but maybe your forms aren't ready to import yet. If you need to log into your account using the browser to import then you can go back to the app and continue.
Differences between Online and the Mobile App
https://ttlc.intuit.com/community/choosing-a-product/help/what-s-the-difference-between-turbotax-onl...
How to use the Mobile App
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-use-the-mobile-app/00/26828
