[EConcertSyncActivityFlags](API\Plugins\ConcertSyncCore\EConcertSyncActivityFlags) & operator&= ( [EConcertSyncActivityFlags](API\Plugins\ConcertSyncCore\EConcertSyncActivityFlags) & Lhs, [EConcertSyncActivityFlags](API\Plugins\ConcertSyncCore\EConcertSyncActivityFlags) Rhs )