Downloading woff failed

Dear Kovid,

I have this ebook that uses external woff. The Viewer can display it without issue. But the the Editor failed to download it, saying the url (with .woff) is not a known type.

Please support it.

How about woff2, I have made a brief research, it seems woff2 is not loved.

Edit: I replaced the woff with a ttf and host it on dropbox (directlink) and Editor couldn't download it either. Ttf from google fonts are downloaded. Then I think it is the issue with downloading Fonts from dropbox, as images (svg, png, jpg) are downloaded.