how to send attachments to agent in amazon connect

hello. i am working on amazon connect chat apis in which i recieve message from facebook and send to agent and vise versa. for text below code is working fine but when i try to send the attachment send by the facebook(webhook) to the agent by using sendMessage api. i am getting the invalid body error. Below is my code. i dont know i am doing wright or not? if possible provide documentation link. below is my code:

import aws4 from 'aws4'; import axios from 'axios'; import dotenv from 'dotenv';

const sendMessage = async function (chatConnectionToken, content, isAttachment) { //content = text or url send by faceebook after parsing // isAttachment = flag for text or image
dotenv.config(); console.log(":::::::::::::::::::::::::::::::::::::::::::::::::",content) const credentials = { accessKeyId: process.env.aws_access_key_id, secretAccessKey: process.env.aws_secret_access_key, sessionToken: process.env.aws_session_token, }; let body;

if(isAttachment==='text/markdown') {body = { Content: content, ContentType: isAttachment// 'text/markdown', }; } if (isAttachment!='text/markdown') { // if "image/png"

body= [
  {
    
    ContentType: isAttachment, //"image/png"
    Attachment: {
      FileName: 'attachment.png', // Replace with the attachment file name
      Url: content, // Assuming content is the URL of the attachment
    },
  },
];

}

const opts = { host: 'participant.connect.us-east-1.amazonaws.com', method: 'post', path: '/participant/message', body: JSON.stringify(body), service: 'connect', headers: { 'X-Amz-Bearer': chatConnectionToken, 'Content-Type': 'application/json', }, };

aws4.sign(opts, credentials);

const config = { method: 'post', url: 'https://participant.connect.us-east-1.amazonaws.com/participant/message', headers: opts.headers, data: opts.body, };

try { await axios(config); } catch (error) { console.error('Error sending message:', error); } console.log(body); };

export default sendMessage;