How does show_content work?

I added content on the edit post page, which also contains the featured image, and the title. The only text in the slide post is “Content to add to caption.”

the setup is as follows:

<?php echo do_shortcode('[slick-carousel-slider design="prodesign-14" category="2" show_content="true" limit="4" dots="true" arrows="true" autoplay="false" sliderheight="400" autoplay_interval="5000" speed="1000" effect="false" loop="true"]
');?>

The HTML generated is this:

<div class="slide-wrap">
		<img >
		<div class="slider-content">
			<div class="slider-content-inner">
 			  <h4 class="slide-title">
			  A little-known, but pervasive, security problem</h4>
			</div>
		</div>
</div>

As you can see, there is no content besides the title.

I tried wrapping the text in <p> tags, but that made no difference. Also tried adding text to caption in the media library. Still doesn’t show up.

Thanks.