[peggyr]

Thx Phil,

I did mean sitemap_images.xml

eg one entry below. Then the image file is 'always' the link to the previous entry image file, caption and title.
...
<url>
<loc>https://mystore.com/terms-and-conditions.html</loc>
<image:image>
<image:loc><![CDATA[https://mystore.com/images/T/widget1.jpg]]></image:loc>
<image:caption><![CDATA[Widget 1]]></image:caption>
<image:title><![CDATA[Widget 1]]></image:title>
</image:image>
</url>