The instructions say "since you've filed electronically, the MI Dept of Treasury already has your return...
Yes, the state of Michigan does allow amended returns to be e-filed in 2018. Therefore, you do not need to mail a paper copy as well. Please view the Michigan link below for more information.
https://www.michigan.gov/taxes/0,4676,7-238-75545_43715-153796--,00.html
