Update embedded images

I have an embedded image in my Grafana dasboard that updates every few seconds. Its a live feed from a camera on the solar array im monitoring and shows the light level. I cannot get the image to update. I’ve tried all the usual tricks that work on other web pages (refresh / image.gif?12345/page reload etc), but Grafana ignores them and the image remains static. Any suggestions?

This is my URL in the Grafana text panel.

img src=http://abc.com/QC/cam.jpg?123456789134567

Love 7.0 …