Imho file picker in stock browser is worse than quick mockup. Also not one native browser allowed to attach a file to a post here. For stock browser i think this is bug introduced by tab unloading.

Edit: what is this file picker madness, anyway, how are the files sorted? I created new email, wanted to email an apk to my android device, picked 'documents' not-a-folder, got huge painful to read rightaligned list with files in uncertain order... there's load of them, what a timewaster, please just give me a file manager component with real folders!