First, Amended returns must be mailed; not filed electronically.
Behind the 1040X, you should include a copy of the corrected 1040. Unless the corrected F1099 shows federal withholding, you don't have to include it. BUT, I would for clarification purposes.
And yes, I would include the the page of electronic postmark and that the return was accepted.
You don't need to sign the corrected 1040, only the 1040X
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