It's something we'd consider, though it might be better posting a separate suggestion as this one specifically tracks multiple file uploads and multiple external links would be roughly independent (from a technical perspective).
Not that it's the same, but there isn't an automatic expectation that the specific external URL being linked to is the actual download. If you can group the multiple external files into a folder, for example, you could link to that folder rather than a specific file within it and this would give a rough approximation.