how to add change event to a file-upload in angular

I am currenly using this package https://www.npmjs.com/package/angular-file?activeTab=readme to upload file , anyone has an idea how we can integrate a change event on this Drop Files where it will automatically call a method after the click browser and then opening a file ?

how do we call a method after a file was drop ? so that I would no longer need to add a button ang then click it , after the file is drop it should call the upload method.

<div ngfDrop
  [(files)]="files"
  [(file)]="file"
  ([validDrag])="validDrag"
  ([invalidDrag])="invalidDrag"
  [ngClass]="{'myHoverClass': validDrag, 'myAntiHoverClass': validDrag}"
>
  Drop Files Here
</div>

#ts code

uploadFile(payload:any) {

    const formData: FormData = new FormData();

    this.files.map((file) => {
      formData.append('attachment', file, file.name);
    });

    this._inspectionService.uploadCSV(formData)
    .pipe(debounceTime(500))
    .subscribe(
      res=>{
        if(res.isSuccess){

        }  
      },
      err=>{
        AppUtils.errorHandler(err,this._notificationService, this.dialog);
      }
    )
  }