When I click "E-file" - "add pdf files" - "add attachment", after selecting the pdf that I want to attach, I click "open", nothing happens, I'm not even getting an error message.

I tried different return and different pdf files, none works. I called the Proseries support, they told me that it could my computer's problem. What is the possible issue here, anyone knows?

Would really appreciate if anyone can help. Thank you!