According to other posts here,
TurboTax Online will ask you for a PDF of your transaction history.
TurboTax CD/download (2020) will not.
As an active investor, you should already be aware that your category Box A or Box D sales without adjustments do not require Form 8949, so there is no reason to import or key in those transactions.
Instead use the "enter a summary" option to put your numbers on Schedule D Line 1a or Line 8a.
No mailing is required, no attachment is needed.
