Image is not placed at `pictures` section

### Question

I am using Docling with Docling Serve 1.8.0 I am setting the following document https://arxiv.org/pdf/2311.18481 and with the default options I produce the JSON document.

The document has a picture on page two, but in the pictures section of the JSON document, the image entry is there, but not the image content (base64). What option do I need to set to save the image embedded there?

Thank you very much