When I try to round only 2 corners on OIE (Online Image Editor) with an image with a transparent background, it turns the background from transparent to black. Is there anyway to stop this? ;m;
Screenshots:

So, I've got this done, so there's space on the right, so the right corners don't round.
Then:

As you can see, it looks fine in the preview...
And finally, once I click apply..:

Anyone know how to stop it going black? ;m;