How to save an Ambience Environment in Physical Product ?

Liverendering ambiencestudio save 
Hello CATIA users ! 
does anyone know how to include the Ambience environment (created in Ambience Studio) during the save of my physical product ? After creating the ambience, I inserted it as a reference in the product and launched a Save but when reopening this same product, the ambience environment is no longer in the tree and I am obliged to re-import it.