Advance Custom Fields and BXSlider with Thumbnail

Hi there,

I am trying to create a gallery with ACF and bxslider with thumbnails.

I have managed to display the thumbnails attached to the post, but when I click on the thumbnail, it selects the final slide.

I am trying to work out how to use the data-slide-index, but I am completely clueless to how to get this working properly.

Please can anyone help?

Paddy

My code is:
https://pastebin.com/W6UM7RTy

And the page in question is: https://www.wrightandcobrighton.co.uk/wordpress/?p=384