Hi raunhar,
Greetings. Hope you are doing well. Thanks for sharing the screencast. I really appreciate this.
Regarding your query, I have checked the screencast and the issue again on your website. It seems something is blocking your PDF file to show it on your website. And after upload the PDF the media URL for your PDF is also not working directly as well.
I would like to suggest you to upload a new PDF file in your WordPress media and copy the PDF link directly and paste it on your browser and check if you can access the PDF there. For reference please check this screencast – https://d.pr/v/q54iLT
If you are not able to access the PDF directly with the media URL then the issue is not with EmbedPress and maybe the issue is from your hosting platform or any security plugin if you are using any.
Please let me know how it goes. I am here to assist you further.
Thanks and Regards.