Thanks for the reply. The thumbnails are actually an independent slider. If you hover over thumbnails, you will see a slider control will appear on left and right side to navigate the thumbnails. The thumbnails are not clickable currently, but that is more of a bug, and they would be clickable.
So, there is a main slider at the top, and then there is a secondary slider (which looks like thumbnails).
Could you help me how can I achieve that, please.
Thanks.