Check out example codes for "unity how to copy something to the clipboard". It will help you in understanding the concepts better.

Code Example 1

GUIUtility.systemCopyBuffer = "test";

Code Example 2

//Add this to any class and just set it with clipboard = "text";
 internal static string Clipboard {
     TextEditor _textEditor = new TextEditor();
     return _textEditor.text;
     TextEditor _textEditor = new TextEditor
     {text = value};


Learn ReactJs, React Native from