PDF upload issue

[eluser]justmelat[/eluser]
Hi

I had a client that had a problem uploading a pdf file a couple of months ago. I posted the issue, but the client was able to upload other pdf's and doc types, so I let it go. We another client is having the same issue. Trying to upload a pdf, that at first glance looks fine, but won't upload. Other file type upload just fine and I see they have uploaded other pdf's.

In my searching I see others have had similar issues with various resolutions, but a few have mentioned that they look at the details of the file type as it is uploading.

How do I do that? I want to see what CI/PHP is uploading or thinks it's uploading.