An SVG-image is actually a representation of various vectors. These vectors are described by a textual representation. If you open an SVG file in a text-editor, you are able to see this and make changes if you want. If Sigil opens an SVG image, it will show you the text instead of the image. That is why you get the URI instead of the image. Get the text representing the image and paste that.
Sigil is not an image editor.
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