Is there a way to write to a specific sheet in an excel multi-sheet file using PhpSpreadsheet without the sheets in said excel file being wiped out?

The write function in phpSpreadsheet always creates a new file thus wiping out my original file. Is this normal?

Below snippet always creates a new file:

$writer = PhpOfficePhpSpreadsheetIOFactory::createWriter($spreadsheet, "Xlsx");
  $writer->save("mymultisheet-spreadsheet.xlsx");