PS 1.6.1.18 - Show only images bound to combination - Fancybox

[Jurist]

Hello,

 

I am trying to figure out, how to make fancybox display only pictures which are connected to particular combination, for example:

https://modernedusche.de/duschelement-800x1200-punkte-pure

This product, has pictures of drain position set for combination named 'Position des Ablaufs', After clicking on particular position: mitte ecke or rand, pictures in thumbnails are changing to valid ones.

However if you click on the picture on left-hand side it and then click on 'next' it shows every product picture, instead of just those bound to the combination.

Is there any way to change this? Which file I should be editing? Any tips are welcome.

If I work it out, I can write a module and publish it here.

Kind regards