State tax filing

When I filed my state of Michigan taxes, I also completed the non-resident City of Detroit Tax Form of which I did not work in the Cith of Detroit the entire year of 2021.  I received my refund from the State of Michigan for my State Taxes, do I have to print off and file my City of Detroit taxes myself or where they filed electronically with my State of Michigan taxes?  How do I get my refund?