Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Reader/Xls.php
private function readMsoDrawingGroup()
    {
        $length = self::getUInt2d($this->data, $this->pos + 2);

        // get spliced record data
        $splicedRecordData = $this->getSplicedRecordData();
        $recordData = $splicedRecordData['recordData'];

        $this->drawingGroupData .= $recordData;
    }
private function readMsoDrawingGroup()
    {
        $length = self::getUInt2d($this->data, $this->pos + 2);

        // get spliced record data
        $splicedRecordData = $this->getSplicedRecordData();
        $recordData = $splicedRecordData['recordData'];

        $this->drawingGroupData .= $recordData;
    }
Read MSODRAWINGGROUP record.