Send and receive .xml( Excel Files) and .jpg/.png (Image Files) through aws Lex Lambda in the form of Attachment

[Upasanadhameliya]

def fulfilled_close(session_attributes):

    return {
        "sessionAttributes": session_attributes,
        "dialogAction": {
            "type": "Close",
            "fulfillmentState": "Fulfilled",
            "message": {
                "contentType": "PlainText",
                "content": "message"
            }
        }
    }

In this code Instead of content type as plain Text, I would like to pass an Image and an Excel file

So the "content type" should be : "Image" or "Excel" And the "content" should be: image_object or an s3 bucket file containing .xls or .jpg file, or any file as a matter of fact.

I want the client to be able to receive the attached image and excel file, and the client should be able to download it. I also want to receive the attachments sent from clients in my 'event' object.

I am using twilio service along with my Lex bot. And I am wanting to achieve it specifically for WhatsApp service?

Is there a way to achieve it?