Why doesn't Gmail in the WEB version load images that Addthis pulls from the site?

Question

gmail

Through a third-party client, what is required is displayed without problems, but not in mail.google.com.
Here is the view

<p>{‌{note}‌}</p>
<br>
<br>
<div style="padding: 5px;margin: 0 auto; max-width: 1030px;"> 
<h1 style="text-align: center">{‌{title}‌}</h1>
 <div>
<a href="{‌{url}‌} ">
<img src="{‌{var_CustomVariable}‌}" alt="" style="width: 100%;">
</a>
</div> 
<p>{‌{var_CustomVariable1}‌} 
<a href="{‌{url}‌} ">More</a>
</p>
</div>

Answer 1

Decided if anyone will collide. On my site there were links like //www.site.ru... Google does not favor them, so I added the "prefix" https to the link string in the script: