To upload a swatch image for your existing Walmart product, please follow these steps:
1. In the Images and Assets section of the product, upload the swatch image if you have not done so already. The main image cannot also be a swatch image.
2. Hover over the uploaded image, and click on the "S" icon.
3. Check the "This image is a Swatch Image" checkbox.
4. Provide the Swatch Variant Attribute. This is usually "color" or "size".
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