Make sure your Filing Instructions page in your tax file PDF says that you need to mail in Form 8949.
Form 8949 is Efiled with your return.
If you originally entered a summary of sales on Form 8949, you are correct that you need to send detailed broker info to the IRS, if your return contained certain types of transactions.
You don't need to Amend your Return to do this, though.
Click this link for more info on What to Send with Form 8949.
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