为什么异步等待与Angular @Action不兼容

Question

这可行，但是如果可能，我想在链中添加更多操作。

this.store.dispatch(new UploadPendingFiles(pendingFiles));
this.actions$.pipe(ofActionSuccessful(UploadPendingFiles)).subscribe(() => 
    alert('UploadPendingFilesComplete');
    this.store.dispatch(new CreateEmailLink(this.getPayload())).subscribe(
        () => 
            this.sent.emit('true');
        ,
        (error) => 
            console.log(error);
            this.errors$.next(error.messages);
        
    );
);

希望使用更多异步等待方式的这种样式，但是会在错误的时间触发事件。

this.store.dispatch(new UploadPendingFiles(pendingFiles));
    alert('UploadPendingFilesComplete');
// Need alert to proc here
    await this.actions$.pipe(ofActionSuccessful(UploadPendingFiles));
    // await Another @Action
    await this.store.dispatch(new CreateEmailLink(this.getPayload()));
// Alert procs here at the moment

@ Action的摘要

 @Action(UploadPendingFiles)
    uploadPendingFiles(ctx: StateContext<DriveStateModel>, action: UploadFiles) 
     return this.uploads.start(action.files, config).pipe(
            tap((response) =>