Symbols from Sketch Libraries file can be shared across all your project, and in case you don't want to share your Sketch Libraries file with other contributors, but you have projects which use symbols from Sketch Libraries file, Plant is smart enough to version it and contributors won't lose the latest version of those symbols. 

Note: If one of your contributors detaches a symbol from Sketch Libraries file, and you got this file's version, your file will lose the link to Sketch Libraries file too. 

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