How to upload image into project?

My question is - how to create project where I can upload image from my computer to 3d model. Similar how it is in Wanzl project:
https://www.blend4web.com/en/demo/wanzl-3d-product-configurator/

For a couple of days I'm trying find some tutorial or some information at forum about this. And I've already found how to change graphic uploaded in Blender but I've didn't found nothing more.

Hello and welcome to our forum!

You can try to use the next functions: replace_image, change_image.