This feature allows you to add your custom color/image to show in swatch options.
In this section, there are certain options like uploading custom colors and images as marked in the screenshot and described the functionality below.
1. Color: choose the color from the color picker to show the custom color in the swatch.
2. Image: upload images from the device to show the custom image in the swatch.
3. Image URL: upload the image using the URL to show the custom image in the swatch.
Note: If you choose a color or upload an image, but the checkbox is not selected, then default variant images will be displayed in the swatch.