You just need to place a ConstantID script on it. In order for the save file to record/retrieve a reference to a GameObject, it needs a ConstantID number - which'll be automatically created with the script.
The ConstantID script is needed whenever you want to save a reference to an object (such as the current camera), whereas Remember scripts are needed to save data about that object (such as a change in a sprite's visibility).
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You just need to place a ConstantID script on it. In order for the save file to record/retrieve a reference to a GameObject, it needs a ConstantID number - which'll be automatically created with the script.
The ConstantID script is needed whenever you want to save a reference to an object (such as the current camera), whereas Remember scripts are needed to save data about that object (such as a change in a sprite's visibility).