Thanks Bill.
I can see the problem - instead of something like:
<img src="rh1.jpg" alt="External humidity graph"/>
in your template, use:
GRHUMO$
That will be replaced with:
<img src="rh1.jpg" alt="External humidity graph"/>
AND tag the image for upload.
Note: Your current code works 'locally' because WeatherCat always dumps all the resources to the output directory every time it does a Custom Web run.
Hope this helps.