My iWork files on my iPad disappeared yesterday, Jan 12. I got this from Carolyn Samit, who must be tech help of some kind somewhere, having posted more than 49,000 times.
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Carolyn Samit San Francisco Bay Area
On the iPad tap Settings > iCloud. Toggle Documents & Data off then back on then restart the device.
Hold the On/Off Sleep/Wake button down until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.
On your Mac open System Preferences > iCloud. Deselect the box next to Documents & Data, then reselect it, then restart your Mac.
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I don't know if it works yet, or if it must be done in the order listed. I am currently trying to restore my iPad from Jan 11. SLOW reloading all of the apps. When I went to do the 3rd part on my Mac (almost all iWork files from iCloud have since been modified on my iPad) nothing changed on my Mac or in iCloud, despite the warning that iCloud docs would be deleted from my Mac when I went to deselect Docs and Data.