public class FBXOBJLoader : MonoBehaviour {

    string src;
    // Use this for initialization
    void Start () {
        src = EditorUtility.OpenFilePanel("Select Model", "", "fbx");
        //Output the Game data path to the console
        Debug.Log("Path : " + src);
        StartCoroutine("CopySomething");
    }

    IEnumerator CopySomething()
    {
        print("Start");
        string path;
        path = Application.temporaryCachePath;
        FileUtil.CopyFileOrDirectory(src,path);
        yield return null;
    }
}

path = Application.temporaryCachePath;

path = string.Concat(Application.temporaryCachePath, "/", Path.GetFileName(src));