I am using kindle previewer on PC
Using this code as my link,
<a epub:type="noteref" href="#n1" style="font-size: 14pt; font-family: arial;">gender</a>, <span style="font-size: 1em;">
And this as the popup note
<aside class="hidden" epub:type="footnote" id="n1"><p style="font-size: 1em; padding-bottom: 3px;"></p>
<a href="#n1"><img alt="return" src="../Images/return.png" width="30" height="16"/></a>
The popup all works fine, but the image is showing in the ebook