I have uploaded Media file image with productid.imagname.jpg but for SkusID how can assign images?

Summary:

I have uploaded media file in zip format and also import products every one product has image in media is available like productid.imagename.jpg but if I created Sku with variants properties like color Black and Blue and I want to assign different image for that SkUID and variants I have done the same method like SkuID.image.jpg But it not taking that image So how to assign image using media type or csv data to SkuID

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