Pobieranie pliku w wiadomości angular 10

pobieranie pliku w wiadomości angular 10

onFileSelected(event) {
    if(event.target.files.length > 0) 
     {
       this.myForm.patchValue({
          fileName: event.target.files[0],
       })
     }
  }

submit(){
    const formData = new FormData();
    formData.append('file', this.myForm.get('fileName').value);
   
    this.http.post('http://localhost:3000/upload', formData)
      .subscribe(res => {
        console.log(res);
        alert('Uploaded Successfully.');
      })
  }