
    <nz-upload [(nzFileList)]="fileList" [nzBeforeUpload]="beforeUpload">
      <button nz-button>
        <nz-icon nzType="upload" />
        Select File
      </button>
    </nz-upload>
    <br />
    <br />
    <button
      nz-button
      nzType="primary"
      [nzLoading]="uploading"
      (click)="handleUpload()"
      [disabled]="fileList.length === 0"
    >
      {{ uploading ? 'Uploading' : 'Start Upload' }}
    </button>
  