I fall also for this.
Pay attention, if you want to change from the CasparCG Client the image in a template, make sure that you add an image layer.
When you add the image from “add resource”, the layer in the composition is not an image layer.
The command to load the template with a remote http image file looks like
CG 1-20 ADD 1 “SN-TEMPLATE-IMG” 1 "<componentData id="imag"><data id="text" value="http://192.xxx.xx.70/xxxxx/uploads/pictures/1708347189.png\“/></componentData></templateData>”
thank you loopic!