Thank you for your post.
I am thinking that this could possibly be a browser issue. Will you please check into that like I mentioned on the other post you commented on? Here is what I have previously suggested:
For your browser are you using Microsoft Edge? If so, would you please try on another browser such as Google Chrome? We've had some reports that PDF files are not displaying correctly in Edge.
Please let me know in the comments below if that works. I'd be glad to troubleshoot further if that doesn't do the trick.