XF 2.1 \XF\Util\File::copyFileToAbstractedPath doesn't seem to work anymore for SVG?

[Jaxel]

I am using the following code to copy an SVG image from a URL to my server:

\XF\Util\File::copyFileToAbstractedPath('https://8wayrun.challonge.com/jdome21sc6.svg', 'data://test.svg');

This used to work... but now it just stuffs an empty file into test.svg. Any ideas on how to fix this?