Using slider instead of featured picture

Sure. You would just need to edit the template file (single-listing.php). Move it to your theme folder and it will take precedence, then you can edit to remove the featured image code and add in a slider code.

Hi guys.

Would anyone be so kind to give me orientation on how to perform this?

What would be amazing for me is to simply register a slider that would display the pictures I enter as a wordpress gallery in the “photos” field below.

Or a simple way to upload 2-3 pictures that would act as a slider instead of the featured image.

Any help on where I can find info for this would be greatly appreciated!