Enigma Slider NOT WORKING!

Hi guys,
I installed Enigma Premium (https://www.ridgewoodfarm.ca/?theme=enigma-premium) and I am using the Theme Test Drive plugin to customize it before I publish it. However, I can’t get the damn slider to work for the life of me!!

I am following the instructions (https://weblizar.com/documentation/themes/enigma-premium-documentation/#slider), which seem to be simple enough but the featured image doesn’t work and then slider disappears every time I try to add a slider – probably bc the image doesn’t get uploaded.

Is this a bug??!!

Thanks for your help.

SH