When mailing Form 1040x to amend a 2018 return, should I attach the electronic postmark, early access consent, and disclosure consent forms from the tax return document?

[Critter · Accepted solution]

No ... that has nothing to do with a 1040X form.  All you attach are any forms or schedules that were added or changed and any forms showing withholding on them that was not on the original return.  Look at column B of the 1040X ... you must send supporting documents for any entries shown.