RefreshableLayer

// listen to layer's refresh event to fetch the attachments
// for the updated features.
layer.on("refresh", async (event) =>{
  if (!event.dataChanged){
    return;
  }

  try {
    const query = layer.createQuery();
    const objectIds = await layer.queryObjectIds(query);
    let attachmentQuery = {
      objectIds: objectIds,
      definitionExpression: layer.definitionExpression,
      attachmentTypes: ["image/jpeg"]
    };

    const attachments = await layer.queryAttachments(attachmentQuery);

    attachmentQuery.objectIds.forEach(function (objectId) {
      if (attachments[objectId]) {
        // process the updated attachments
        let attachment = attachments[objectId];
        console.log("Attachments for objectId ", objectId, attachment);
      }
    });
  } catch (error) {
    console.log("attachment query error", error);
  }
});

// listen to layer's refresh event to fetch object ids of completed features
layer.on("refresh", function(event){
  if (event.dataChanged){
    const query = layer.createQuery();
    query.where = "Status = 'Completed'";
    layer.queryObjectIds(query).then((objectIds) => {
     // process returned features
    });
  }
});