I had a moment of panic when my iPad (which had the highlighted version of this article ready for writing up) decided that it didn't have enough memory to open the relevant app. Because it's been downloading new versions of the iOS since forever but hasn't had the elbow room to install them. I temporarily deleted a bunch of apps to get things freed up, but the big problem is that I can't export the marked-up versions of the files and what the iPad really needs is to be restored to factory setting so I can start fresh. Or upgrade to the next iPad or something. Or something.