Returns all files for specified action.
Parameters
| Name | Type | Description | 
cuuid required  | string | iShare action  | 
action_uuid optional  | string | uuid of specified action  | 
cb optional  | function | callback function | 
Example
this.getTrackingFiles = function(cuuid, action_uuid, cb){
  return _request({
    method: 'GET',
    url: '/is/tracking/' + cuuid + '?action=' + action_uuid,
    callback: cb
  });
};
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