Current Fancybox version places caption at the bottom of the window, not right below bottom side of the image. I'm trying to ask the developer too but I guess I won't get fast answers.
The are also some questions here for this issue, but it seems the suggestions found do not work anymore, for example by usign title
or data-fancybox-title
.
I also tried to mod the template (there's an instance option for that), but it doesn't work.
So, is there some hidden ways to do it?