Turbotax is misleading if it implies you can get the forms to be mailed out of your tax return PDF file.
Other than Form 8453 ( a cover sheet), that's not the case,
The Form 8949 saying "see attached" you get out of your tax return PDF will not have any details.
It is for that reason you are being asked to mail in the details.
If the detail is already on your filed return, there is nothing to mail.
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There is no point to mailing the coversheet by itself. That will just annoy the IRS.
There's no point to mailing the Form 8949 that only says " see attached" because that doesn't have any details either.
The Form 8949 to be mailed is the one that has the details - you supply that document (or acceptable substitute).
