How much you want to bet this is a condition of the Microsoft / Dropbox integration/partnership.This particular mess is due to Dropbox, not Apple. For some reason, Dropbox decided to not support the function that lets you open iWorks documents stored in cloud locations. I can store a pages document in iCloud, OneDrive, or Google Drive, and they all can be opened and edited from inside Pages on the iPad. But store a pages file in Dropbox, and you have to use the "open in" function from the Dropbox app to send a copy to Pages.