In diagram , Image not visible when export it

I am using dhtmlx diagram and export it to png and pdf. My template contain image but when i export it then no images show on either pdf or png. Can any one suggest to do configuration

Please, make sure you are using the exportStyles property:

to define all the using css for the export service.
Here you can find an example:
If the problem still occurs for you please, provide a complete demo or a demo link, where the problem can be reconstructed locally.