Check out example codes for "css how to place an icon on a photo". It will help you in understanding the concepts better.

Code Example 1

<link href="" rel="stylesheet"/>

<div class="container">
   <img src="">
   <a href="dog.png" download="new-filename"><i class="fas fa-download"></i></a>

Code Example 2

.container { position: relative; }
.container img { display: block; }
.container .fa-download { position: absolute; bottom:0; left:0; }

Learn ReactJs, React Native from