code: function (params, callback) {
          /**
           * Callback for QB.content.markUploaded(params, callback)
           * @callback markUploadedFileCallback
           * @param {object} error - The error object
           * @param {object} response - The empty body
           */
          this.service.ajax({
              url: Utils.getUrl(config.urls.blobs, params.id + '/complete'),
              type: 'PUT',
              data: {
                  size: params.size
              },
              dataType: 'text'
          }, function(err, res){
              if (err) {
                  callback (err, null);
              } else {
                  callback (null, res);
              }
          });
      }
docs: Declare file uploaded. The file's 'status' field will be set to 'complete' ({@link https://docsdev.quickblox.com/rest_api/Content_API.html#Declare_file_uploaded read more})
  @private
  @memberof QB.content
  @param {object} params - Object of parameters
  @param {number} params.blob_id - The id of file to declare as uploaded
  @param {number} params.size - Size of file, in bytes
  @param {markUploadedFileCallback} callback - The markUploadedFileCallback function