no material design button
As an application of this type you don't change between OneDrive business and OneDrive personal every second and you don't see the used storage every second, I'd make another swipe screen with into the graphic of used storage, the title will be " OneDrive personal" or " OneDrive business" and the button to switch to the other OneDrive. In my opinion the button in material design and the tile of the app home page are just wasted space. Plus make the transparent tile.
*errata corrige: ...and the TITLE of the app's home page...