Question About Posting Images on Kbin

I posted a photo on kbin yesterday from my photo hosting service. I thought the image would hot link from my gallery so I wouldn't be using bandwidth from the kbin.social server. But it looks like the image gets picked up and hosted on the kbin server anyway.

Is there any way to hotlink from an outside host where the image will display in the post? If not, are there some general guidelines about image file size?