You can import color set materials downloaded from Clip Studio ASSETS using the Color Set palette in Clip Studio Paint.The process depends on your dev
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Release Notes - Clip Studio Paint
Release Notes Clip Studio Paint Ver. 2.0
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Assets: How can I import color set materials? - Clip Studio Official Support
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Materials I downloaded not showing up for me to import?? : r/ClipStudio
Assets: How can I import color set materials? - Clip Studio Official Support
How To Install And Use Materials In Clip Studio Paint - Don Corgi
Downloading and Installing Assets
How To Install And Use Materials In Clip Studio Paint - Don Corgi