Question about Amended returns for Federal and Michigan

I am filing amended returns for Federal and Michigan, due to a tax form that only arrived after I originally files.

 

In both cases I am getting refunds.

My original returns were both e-filed via Turbo Tax, and I e-filed the Amended return.

 

Do I need to send any paper forms with the Amended returns? The TurboTax instructions are confusing. It gave me a reminder to fine a paper form, but I think that might be only for Michigan, and I don't understand the TurboTax instructions. It gave me a document that gave an address where to send -- it looked like an address for a Federal Return. The 1040-V had a voucher for a payment of several thousand dollars that I didn't understand at all, and then there's a 2nd page for "2024 MICHIGAN Individual Income Tax Certification for e-file MI-8453" that says "KEEP FOR YOUR RECORDS."

 

What -- if anything -- do I actually need to us USPS to do, for either Federal or State?

 

Thanks.