Navigation arrows in FancyBox for content?

Question

fancyBox

Colleagues welcome!
The site has 6 blocks with products, each of which has a “details” button, when you click on it, a modal window opens with a description and a picture.
It is necessary that in this modal window there were arrows "next" "previous", while if, for example, we open the 5th block, then the contents of the fifth block are opened.
nothing complicated in appearance - create 6 modal windows and link links to them.
I used two options: the usual modal windows from bootstrap and the fancybox plugin. Fancybox has such a feature only for pictures - you specify rel="group" and "flipping" is connected, but this does not work for content ...
how can you still set the transition between modal windows?