Through the ‘Recents’ folder in Excel, I try to open an Excel doc stored in Dropbox, on my iPad Pro, I get a request or which asks if I want to link Microsoft Office Mobile with Dropbox. It asks which account I want to link with; I tell it. (I have a Personal Plus account). It briefly tells me, ‘working on it’ then jumps back to the ‘Recents’ files, without opening the doc. If I try to open it from Dropbox, via the App, the same thing happens. The App Center in Dropbox is no help at all, it indicates that MS Mobile is linked, and as far as I can see offers no way of linking a new App anyway. Dropbox Support is worse than useless; as a Plus account, I should have access to live chat, but I cannot find any reference to or way of accessing this. I have already wasted several hours with this run-around, and am stunned by the poor design of this whole site.