bool AddPackageActivity ( const [FConcertSyncActivity](API\Plugins\ConcertSyncCore\FConcertSyncActivity) & InPackageActivity, const [FConcertPackageInfo](API\Plugins\ConcertSyncCore\FConcertPackageInfo) & InPackageInfo, [FConcertPackageDataStream](API\Plugins\ConcertSyncCore\FConcertPackageDataStream) & InPackageDataStream, int64 & OutActivityId, int64 & OutPackageEventId )