changes into code
sudo apt install poppler-utils pandoc unoconv ocrmypdf libreoffice ===================== sudo chown -R www-data:www-data /var/www/html/merger/ sudo chmod -R 755 /var/www/html/merger/ sudo chmod -R 777 /var/www/html/merger/uploads/ sudo chmod -R 777 /var/www/html/merger/merged/ sudo chmod -R 777 /var/www/html/merger/temp/