Alert does not wait for user response and the form completes, Does anyone know how to solve this problem?

I need it in response to a button that is not on the form because I have several buttons on the form. Thank you

 function Upravit(){
 Swal.fire({
  title: 'Are you sure?',
  text: "You won't be able to revert this!",
  icon: 'warning',
  showCancelButton: true,
  confirmButtonColor: '#3085d6',
  cancelButtonColor: '#d33',
  confirmButtonText: 'Yes, delete it!'
}).then((result) => {
  if (result.isConfirmed) {
    Swal.fire(
      'Deleted!',
      'Your file has been deleted.',
      'success'
    );
    return true;
  } else {
      return false
  }
});
}

<button {if $d->aktivni == 0}disabled{/if} onclick="return Upravit()" 
n:name="upravitreklamaci" type="submit" class="btn btn-primary btn-lg btn-block">Upravit 
reklamaci</button>