Using FancyBox with CDN (Content delivery network)

Hello, I have a little problem with FancyBox for WordPress. It has worked fine for me for a long time on several version of my blog.
But recently I started using CDN (MaxCDN) on my blog, so all the images that are shown on my blog are not on the same address as the blog itself.

Plugin works fine for pictures which start with:
https://techninja.cz/wp-content/uploads/

But all my pics are now being served to readers from this address:
https://maxcdn.techninja.cz/wp-content/uploads/

So basically what I’m asking is if there is some way to tell the plugin that he should show “external” images in a same manner he shows “local” ones.

I love the plugin btw. It’s one of the first ones I install when I’m making a new installation of WordPress.