Uploaded Media Won’t Open

Many of the topics I have researched on this issue is that some people are not able to upload the media.

This is not the case.

I am allowed to upload the media (pdf in this case) and able to paste into the post. I published the post, and when I try to click on the link I’m met with a page that says:

Sorry, but you are looking for something that isn’t here.

Please help.
Thanks!