5.7. Sort files or folders by Name, Date or Size

To use this option, go to the Documents list or the  iCloud folder and swipe it downwards to see the very top of the screen.    

On iPad, you can change a sort direction by performing a double tap on Name, Date or Size.   

For instance, to sort files from Z to A, tap the Name button once. If the Name button is tapped a second time, documents will be ordered from A to Z you tap the Name button once, documents will be ordered from A to Z.

On iPad:

On iPhone: