I have same problem with this plugin – images display in the print version, but no images in PDF file – exclude Site Header image, if i set option “Whole page PDF”.
I was insert string “$mpdf->showImageErrors = true;” into “pdf-print.php” file according to your recommendations, but no saw any errors or warning messages.
Are there any other recommendations for finding out the reasons / solving the problem?
FreeBSD 11.4-RELEASE-p3 amd64;
nginx-1.18.0;
WordPress 5.5.3 with Bam theme;
PHP 7.4.12;
PDF&Print version 2.2.3