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Generally, you only have to attach a camera's base_link
somewhere in your scene. It should have a unique name, so no two cameras or sensors share the same frame name. You can refer to this question on how to do this.
I don't know what you mean by "appear another tf between camera_link and pointcloud". I also don't understand which frames are connected and which are not. Please do not mix up the terms "tf", "transforms", "frames" and "frame names" if you explain further.