yanglao/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Ods/Thumbnails.php

<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Ods;

class Thumbnails extends WriterPart
{
    /**
     * Write Thumbnails/thumbnail.png to PNG format.
     *
     * @return string XML Output
     */
    public function write(): string
    {
        return '';
    }
}