PDF´s not loading

Hello, I entered the following text into the MIME TYPE under Plesk Server

text/javascript .mjs

but unfortunately the PDF files still don’t load. What am I doing wrong? Thanks and best regards.

Here is a Pic to show you

https://syltgis.de/wp-content/uploads/2025/08/text.jpg

The page I need help with: [log in to see the link]