inform user about download size so could be interrupted

[yarikoptic]

Instead of

could show "Loading image of size 1.7G from" (not sure why URL isn't there either) after getting size from the response header

example URL to try: https://bioimagesuiteweb.github.io/alphaapp/viewer.html?image=https://api.dandiarchive.org/api/assets/db080212-f712-4f09-b3b6-b39554cdd74e/download/

edit1: even cooler would be to show download progress bar with ETA etc ;)

[XeniosP]

This is a different issue.

bisweb takes a URL and splits it into "/" and uses the last part of the URL as the filename. We do not have any sense of download progress or ETA at this point.