Upload uses a file pattern to control what files are processed

Either `year`, `year/month`, `year/month/day`, `year/month/day/hour`, `year/month/day/hour/minute`, or `year/month/day/hour/minute/second`, depending on what fields exist in the file.

But `year/month/day` is probably by far the most common, so that should be the one I mention up-front in the documentation. (There is another sentence later stating that the fields may differ depending on the time stamp.)