Sort files by upload date or name

Right now, files that I upload are not sorted by upload date and not sorted by the filename either. Just how on earth are they sorted? It seems to be by filesize. This makes no sense for me or my customers. I want my customers to quickly be able to see the newest version at the bottom of the list, while still being able to download a previous version if they need to. At the very least, I should be able to re-order the list myself to how I want my customers to see it.