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When the picture is small and does not cover the entire surface of the shape without losing its quality, you have the option to tile it. Tiling fills the shape surface with a small image by repeating it as if it were tiles.
You can fill the shape surface with an image and tile it by using the Shape.fill.texture_fill.is_tiling property and setting it to true. Please see the following sample code, its sample Excel file as well as the screenshot for reference.

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