Yes, it is a fairly new development.
For e-filing purposes, the original purpose of Form 8453 is to attach the Form 8949 and 1099-B details supporting documents. With this new development where you can upload the 1099-B details, you would not need to mail in anything.
When you e-file the return, the uploaded 1099-B details and Form 8949 will also be e-filed to the IRS. No additional information needs to be mailed in.
@PAGB
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