Sending File to api - Custom Boilerplate Integration

const handleFileChange = ($event) => {
      if ($event.target.files && $event.target.files[0]) {
        form.value.File = $event.target.files[0];
      }
    };

const handleFileChange = ($event) => {
      if ($event.target.files && $event.target.files[0]) {
        const reader = new FileReader()
        reader.readAsDataURL($event.target.files[0]); (or reader.readAsByteString($event.target.files[0])
        reader.onload = () => {
          const encodedFile = reader.result.split(",")[1];
          form.value.businessRegistrationFile = encodedFile;
        }
      }
    };