How do I add a personal signature with Surface Pen ?

I do not see an obvious way to add my signature ( or other sketch ) to a writer document using Surface Pro Pen. Am I just overlooking the obvious ?si

Record your signature as a graphic file and insert the picture. Pay special attention to the anchor.

I personally use .png format because it can have a transparent background (.jpeg can’t) so that the signature bounding box does not hide any part of text.

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