Duplicate question. Please stick to your first one here
https://ttlc.intuit.com/community/intuit-turbo-support/help/i-put-my-2019-in-my-2020-amended-tax-returns-in-the-same-envelope-they-received-my-return-but-it-s/00/2348587
Call the IRS and ask them.
Someone replied they staple everything together but they were folded separately and had 2019 on one and 2020 on the other and calling the IRS was my next option Monday morning