Use real image as input in chatgpt prompt "Generate image" module

Hello,

I’m trying to modify an image using the OpenAI image generation API. The URL of the source image is in a Google Sheet.

When I include the image’s URL in my prompt, it seems the image isn’t being used. The model ignores the original image and generates a new one based only on my text instructions.

What’s the correct way to pass a source image to the API so it can be modified ?