We strongly suggest avoiding using external uploads. We can't track how people access them and can't guarantee that the files are actually downloadable. If people try to download them and have an issue then they're likely to try again and it will get counted again. Any download counts for external files are at best an estimate.
The good news is that our default limit for web uploads is now 1GB since the past year, and if you use butler then you get an even larger default upload (I think 1.5x if I remember correctly)
In the future we're likely to disable external uploads expect for special cases where people seek approval.
Thanks