The status "Completed" for this feedback item was not correct and I was quick to revert it back to "Pending Review" after you pointed it out. Please excuse me for the misunderstanding.
This "Test as Step" feature for Test Studio Mobile is not implemented, yet. I hope that we will be able to include it in our future releases, as it is gathering more votes.
When the feature says "Completed" it means it has been implemented and will be released in a future version? If yes can you please tell me in which version and when is this feature going to be released?