Firebase notification sending image

 const payload = {

        notification: {

          title: "Test",

          body: message,

          image: 'https://firebasestorage.googleapis.com/v0/b/ntest.appspot.com/o/mmedia%2Fpreviews%2FNature1-min.png?alt=media&token=0241cec4-26b0-4463-8701-c94404d3ee12'

        },

      } 

let response = await admin.messaging().sendToTopic(topic, payload, options);

console.log('response for sendToTopic ',response);

references:

https://stackoverflow.com/questions/38504078/firebase-expandable-notification-show-image-when-app-is-in-background