Is there a way to attach PDF's in threads?

It seems to work fine. Just attach it like a pic. It will have to be downloaded by anybody who wants to see it.
The other option is to covert the pdf to jpeg pic. There are several free downloadable programs online to do this.

Thanks Griff, was that using the image uploader?
I was on my phone and using the uploader, it said any files that weren't Jpg or whatever would still attach.
But didn't seem to show up.

That was loading just like a pic off my PC. It doesn't show as uploaded or attached until you actually hit the post button.

Thanks, pretty sure I did and didn't appear. But may of been a failure on my end.
I'm not to fond of being on my phone on here instead of a PC anyways.

The mobile skin does not have that button, but if you click into the upper left menu and select "View Full Site" you should be able to do it.

Back to this one more time. I try a certain PDF file on my PC, Windows 10, Firefox browser.
I get the first capture, then the second. A Google search indicates it's got something to do with Adobe Illustrator maybe?
The file says it's a PDF on my PC. Did a grab of the properties tab for it.

Testing PDF attachment

EDITED TO ADD: Very possible it's an Illustrator, yes