I already attached a Consolidated Tax Information Statement 1099B from Vanguard and now they sent a revised statement. How do I replace the PDF attachment to the return?

When you say you attached the 1099-B, do you mean you downloaded it into your return?

What is the way to attach 1099B to my return? How do you do that? I didn't find in my TT Premier 2020 any options to attach my 1099B to my return.

It appears some filers are getting this prompt and not others.

TurboTax has not published any information that I know of on such a feature, that other tax software has had for years.

@mmelancon27 

Did any totals of proceeds and/or cost change your capital gains/losses?

if so you would have to amend,

otherwise, do nothing.

Yes, I'm entering totals for all my categories, some with adjustments, but then I see only "mailing instruction" appeared  but no any prompt for PDF attachment. Are you using online version or CD?  I'm using CD.