When I generate a link to a file and share it. Maybe it would be helpful if you could count how many people clicked on the link and how much bandwidth it took. If you can display the links in a list and sort by number or bandwidth. At some point people will generate a link and post it on social media and then wonder why the bill keeps going up.
And the delay of a few hours. Is there a point at which you know the stats are correct older than x? It could be helpful if a timestamp is shown until when the stats are correct and no longer change.