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• PropertyAssetCtrl was previously extended with ThumbnailPropertyCtrl to optionally display a thumbnail and floating zoomed in preview of the selected asset. • This change allows overriding the image that comes from the thumbnail system with a custom image provided as an attribute. The custom image can be specified as either a file path or a buffer containing a serialized QPixmap. • This will be used by the material system in the editor to provide a dynamically rendered image of the material with property overrides applied so that the image will update as the user customizes their material. Signed-off-by: Guthrie Adams <guthadam@amazon.com>