Already eFiled 2021 1040 with Turbo Tax, but owe IRS

I can't seem to find a definitive answer on either Turbo Tax or IRS sites for:

• I've already efiled my 1040 using Turbo Tax, but I owe a small balance that I did NOT pay electronically when I filed because the fee to pay was more than the amount I owe.
• I've received confirmation from Turbo Tax that the IRS accepted my return
• Turbo Tax instructions say there's no fee if I mail the Form 1040-v (voucher) with a check to the proper IRS collection site for my state BEFORE the April 15 deadline.  Turbo Tax does NOT mention any other attachments are needed.
• IRS instructions, however, say to mail a

  copy of the tax return

  WITH THE VOUCHER.  This seems to be just a general instruction for all people MAILING their returns in.  I could not find a specific instruction for what eFilers that don't pay electronically should do.

I thought about including a copy of the email from Turbo Tax that says my tax return was accepted by the IRS??  I'd prefer not to include unneeded attachments, as I know the IRS isn't happy when you do that.  I also don't want them to impose a penalty for not including all the information they require.  Any suggestions?