Modal on Navigation Bar

Big phone? Here's one idea for making all your folders, including your starred emails more reachable!

Open the folders by clicking on the home button, scrolling up on the modal expands it to full screen, revealing all your folders, and you can switch to any custom folders, or take more actions your folder using native iOS right swipe.

What do you think? Is it intuitive? Users will get it without explaining in walk through card? Discuss.