@interface GroupActivities.AttachmentUploadTask : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ topic;
    void /* unknown type, empty encoding */ file;
    void /* unknown type, empty encoding */ developerMetadata;
    void /* unknown type, empty encoding */ id;
    void /* unknown type, empty encoding */ stateMachine;
    void /* unknown type, empty encoding */ key;
    void /* unknown type, empty encoding */ protector;
    void /* unknown type, empty encoding */ assetManager;
    void /* unknown type, empty encoding */ topicUploadTask;
    void /* unknown type, empty encoding */ signalHandler;
    void /* unknown type, empty encoding */ _state;
}

@end