Per the IRS:
"If you e-file your return but choose not to report each transaction on a separate row on the electronic return, you must either (a) include Form 8949 as a PDF attachment to your return, or (b) attach Form 8949 to Form 8453 (or the appropriate form in the Form 8453 series) and mail the forms to the IRS."
https://www.irs.gov/instructions/i8949
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
