AWS Cognito - Offline Data Availability

I am creating a phonegap app and using AWS Cognito to store user data. Cognito's description says the data is available offline. This doesn't work in my code:

var add_data;    
function getCognitoData(){
 var params = {
  IdentityPoolId: COGNITO_IDENTITY_POOL_ID,
  Logins: {
   'graph.facebook.com': FACEBOOK_TOKEN
  }  
 };
 AWS.config.region = AWS_REGION;
 AWS.config.credentials = new AWS.CognitoIdentityCredentials(params);
 AWS.config.credentials.get(function(err) {
  if (err) {
   console.log("Error: "+err);
   return;
  }
  console.log("Cognito Identity Id: " + AWS.config.credentials.identityId);

  var syncClient = new AWS.CognitoSyncManager();

  syncClient.openOrCreateDataset('myDataset', function(err, dataset) {
   dataset.get('myKey', function(err, value) {
    console.log(value, err);
   });

   add_data = function(thisid, thisval) {
    dataset.put(thisid, thisval, function(err, record){
     dataset.synchronize({
      onSuccess: function(data, newRecords) {
       console.log("success", newRecords);
      },
      onFailure: function(err) {
       console.log("error", err);
      },
      onConflict: function(dataset, conflicts, callback) {
       console.log("sync conflict", dataset, conflicts);
       var resolved = [];

       for (var i=0; i<conflicts.length; i++) {
        resolved.push(conflicts[i].resolveWithRemoteRecord());
       }

       dataset.resolve(resolved, function() {
        return callback(true);
       });
      }
     });
    });
   }
  });
 });
}

      

        
        
        
      

    

The AWS credentials for the identity pool and Facebook token are already set up and working online, but I am not getting the dataset data when I am offline.

Am I doing something wrong, or is it not possible at all to get the Cognito dataset data while offline? I read that the data is actually stored in local storage.

I am using the current AWS SKD (Release v2.1.42) and Amazon Cognito JS.