This tool supports to extract the 2D multiple-sprite sheet in Unity3D into separated sprite files. This would be very useful when you have a large multi-sprite sheet and you just want to use some of them in your game.
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Open the Package Manager window by selecting the Menu "Window/Package Manager"
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Paste the following link:
https://github.com/nmtoan91/Unity-Plugin-Extract-Multiple-Sprite.git?path=/Assets/MultiSpriteExtractTool