You can upload images for partial product options, naming each image according to its corresponding value code (e.g., "format_14_8x21.png" for the A5 format with code "format_14_8x21").
Here you can upload images that are to be used for the individual partial product option values.
Note that the image name corresponds to the code of its value.
Example:
Let's assume we want to change the image of the format (A5) framed in blue,
In this example, the format has the code: format_14_8x21, so now we should name the image of the new image for example format_14_8x21.png