用angular写响应式表单，要支持上传文件怎么用formControl来控制

nz-upload 标签好像不支持formControlName属性，我现在要在表单中选择图片上传，怎么用formControl控制？？？

HTML：

<nz-form-item>
  <nz-form-label [nzSpan]="2" nzRequired>附件上传</nz-form-label>
  <nz-form-control [nzSpan]="22" nzHasFeedback="false">
    <div class="clearfix">
      <nz-upload 
                formControlName="attachments" 
                class="upload-list-inline" 
                nzAction="123/posts/" 
                nzListType="picture" 
                [(nzFileList)]="fileList2">
        <button nz-button type="button">
          <span><i nz-icon nzType="upload"></i>上传</span>
        </button>
      </nz-upload>
    </div>
  </nz-form-control>
</nz-form-item>

ts：

form: FormGroup = this.fb.group({
    id: [],
    dispute: this.fb.group({
        Details: ['', [Validators.required]],
        attachments: ['', [Validators.required]]
    }),
    applicant: this.fb.group({
        applicantType: ['个人', [Validators.required]],
        applicantName: ['', [Validators.required]],
    })  
});

https://blog.csdn.net/qq_29483485/article/details/84589989