@nongkangma wrote:
Not only for this situation, wondering if there is any access that users can attach a PDF?
I don't want to say "never" but I'm pretty sure that's the answer. The IRS does allow attachments, and Intuit's ProSeries for tax professionals can attach PDFs, but Intuit (or the IRS?) doesn't allow it for consumer software. I suspect they don't want to allow you to do something that would result in a rejection that they would get blamed for.
One other possibility might be to upgrade to the Turbotax full service option. With that service, you work with a live tax professional to file your return. I believe that if you encounter a situation that can't be filed with regular Turbotax, the pro can take over and submit the return with the pro software. However, I don't know this for sure, and I would want you to confirm that before you paid the upgrade fee.