iCloud is, when you think about it, kind of a thankless service. At its best you don’t notice it—everything, in the unofficial mantra of Apple dating back decades, just works. Your data is in sync across all your devices, changes update immediately, and you never get a single error message. The thing is, like a lot of Apple tech, it’s a black box. Data goes in, data goes out. What happens in the middle…well, shrug. You just put your faith in the fact that what’s working will keep working. But as anybody who’s ever tried to troubleshoot iCloud problems can…