It is brilliant that you can edit existing materials, bringing in material textures from your favourite source, manipulate them to make your model look exactly as you want it, and, as I have just discovered, save them as favourites.
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However, as Fusion will never satisfy everyones material needs - it would be great that once you have edited and saved a new bespoke material if you could save it in your own Personal materials folder, and in personalised sub / catagory folders so you can create your own collection.
The attached are quick renders - showing Concrete, A specific Oak finish from a panel company we use (Egger) and whilst you may not want clouds in your Bedroom furniture - you might want it somewhere - for thise of us using printed glass, for example.
Cheers
Kevin
(Fusion makes me happy)