Plugin loads but

Unfortunately, I’ve no link to provide to the site I’m buildin’ since it’s on my localhost. But the thing is I’m having such a hard time placing this plugin to use.

On my home, there will be a small blog feed with three posts on a single column and the thing is I’m trying to use Smart Crop to handle the focus on the thumbnails.
Added a class as in the FAQ suggestion with .wpsmartcrop-image and even tried the wrapper .post-img.

.post-img {
max-width: 40%;
position: relative;
overflow: hidden;
	img.wpsmartcrop-image {
	display: block;
	width: auto;
	max-height: 288px;
	}

But even tho I can see it loads quite alright, with e.g. data-smartcrop-focus="[60,49]", there’s no change at all in the placement of the image. I’ve gone inside every featured image in the posts that are already there, enabled the smart crop, placed the focus, saved, updated the post. Nothing changes. Not sure if I’m getting anything wrong, so I’d appreciate any help. But the data-smart-crop attribute should call for something, which I don’t know what is.

Running a docker image with presspack and working with Sass.