Just to follow-up on the prior posts, review your Form 8453 and see if there is a check-mark next to the line for Form 8949 (it will be the last item on Form 8453). If there is a check-mark in that box, your Form 8949 was not electronically filed with your return. Therefore, you will need to mail such Form 8949 to the IRS.
Regarding the use of an "acceptable statement" in lieu of sending Form 8949, yes you can send such a document instead of sending Form 8949; however, your alternative statement needs to contain the same information. You might be able to compress your 20 page Form 8949 into fewer pages which will cost less to send; however, you do need to include the same information as contained on Form 8949.
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