a few ways to do it
- put the feature image in a repeating group 1 column by 1 row and then use the arrows to page between
- put the image in a group and when user clicks arrows or images it changes the data in the group to the selected image
#1 is easier and you can set the data to just reference the thumbnail repeating group - that way you can use on click go to page current thumbnails index (page number)