I'm trying to add a file to one of my forum posts because I'm having trouble with Pillars of Eternity. When I click to upload the file it says, "No file was selected for upload." Even though I chose the file and it shows it as being chosen. I have tried both uploaders. Can anyone help me with this problem? Thank you.

What file extension does the file use (the letters after the dot/period)? It's possible the forum isn't configured to allow it as an upload. If that's the case, you can zip the file with something like 7zip or WinZip and try uploading that instead.