public function allDrawings(Spreadsheet $spreadsheet)
    {
        // Get an array of all drawings
        $aDrawings = [];

        // Loop through PhpSpreadsheet
        $sheetCount = $spreadsheet->getSheetCount();
        for ($i = 0; $i < $sheetCount; ++$i) {
            // Loop through images and add to array
            $iterator = $spreadsheet->getSheet($i)->getDrawingCollection()->getIterator();
            while ($iterator->valid()) {
                $aDrawings[] = $iterator->current();

                $iterator->next();
            }
        }

        return $aDrawings;
    }