Can anyone advise how i can import CodedUI tests to Test Manager

I am very new to Automation Testing. Firstly, I created test scripts in Test Manager then imported these to CodedUI (VS 2017) and edit the code. This is because I want to grab performance data into a CSV file for bench marking.

Now I am stuck as I am not very sure how to import the scripts back to MTM.

I have used the tcm.exe to import these test scripts back to MTM. I then run the requirement query in MTM and this returned results. I can see the edited test script (from CodedUI), but whenever I open the test cases it is showing blank.

Can anyone please advise? I have tried looking at videos but none of these have helped me out.