If you completed a run but want to update the device that was used to track it (for example, marking it as a treadmill run instead of an outdoor watch run), you can easily change this in your settings.
How to change your Gear:
Locate the specific completed run by tapping it in your Plan tab, or by going to Profile -> Workout History.
Tap on Gear section of the run details.
From here, you can change the device used for that workout (e.g., select URUNN app, Watch, or Treadmill).
Your run will now correctly display the updated tracking gear.