Thank you,
I also received an answer from E2PDF and their solution worked like a charm:
If it’s completely static PDF, you must be able to upload it to WordPress and use shortcode without creating E2Pdf Template as:
[e2pdf-attachment pdf="/home/example.com/public_html/wp-content/uploads/2021/09/PDF.pdf"]
P.S. Keep in mind please that currently “pdf” attribute requires full path to file. To get full path you can enable “E2Pdf” -> “Settings” -> “Turn on Debug mode” and check the path to WordPress installation at “E2Pdf” -> “Debug” page.