Before and after slider on Productpage on Sense Theme

Store Design
1

Hello, can some one help me?
I can´t code and need instruction how to get the before and after slider on Productpage on Sense Theme.

The best solution would be to have it in the product description, because I have different products and it would be unnecessary on every productpage.

Thank you!

2

Here you can find the code and instruction how to do it, but its not working:

https://ecomexperts.io/blogs/liquid-tutorial-shopify/before-and-after-slider

Maybe someone can check the code and send a solution?