How do I quickly browse the stuff in my account once I have a lot of files?
In the Photos, Music, and Documents tabs, you can zoom out at any time for a birds-eye view of all your content. Simply tap on any of the date or artist headers to collapse or expand that section. When sections are collapsed, the left side of the view window shows the month / year or letters of the alphabet. This is the "zoom scroll jump bar"; tap on a month / year or letter to jump to the relevant section.