Hello again 
I have succesfully rendered my visualisation and set everything up but the preview didn’t change.
How to fix it?
Do you mean that the baking has finished, but no change is visible in the editor viewport?
Have you tried reloading the scene?
OK, you mean the preview image that is shown before the visualization is loaded, right?
It is regenerated every time you open or reload the scene inside the editor. So, after making changes that impact this preview image please reload the scene (Ctrl+R) and only then upload the scene.
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