Unfortunately you can't attach a PDF copy of Form 8949 to your return if you Efile.
You can use TurboTax to prepare a Form 8949 with a summary of Short Term/Long Term transactions, then mail in your PDF summary (or other supporting documentation) after you Efile.
Click this link for more info on How to Enter a Summary in Lieu of Individual Transactions and Mailing Form 8949 for Summary Totals.
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