在Kendo Angular Upload中如何在单独的按钮上发布上传的文件而不是自动上传

<button (click)="uploadFiles()">上传文件</button>

import { Component } from '@angular/core';
import { UploadEvent, removeFile } from '@progress/kendo-angular-upload';

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html',
  styleUrls: ['./upload.component.css']
})
export class UploadComponent {
  public files: any[] = [];

  public uploadFiles(): void {
    const upload = this.uploadComponent.upload;
    upload.uploadFiles();
  }

  public onUpload(event: UploadEvent): void {
    this.files.push(...event.files);
  }

  public onRemove(event: removeFile): void {
    const index = this.files.findIndex(file => file.uid === event.file.uid);
    if (index >= 0) {
      this.files.splice(index, 1);
    }
  }
}

<kendo-upload
  #uploadComponent
  [autoUpload]="false"
  (upload)="onUpload($event)"
  (remove)="onRemove($event)"
></kendo-upload>