You can edit the workflow in prod, all you have to do is create an unmanaged solution in prod, add the flow and then it’s editable. The only restriction is you can’t go directly into the managed solution and edit items from there.
when you make a modification to a managed flow, what you are doing is adding an ‘unmanaged layer’ customization. The flow will give you a yellow banner warning you of this, but if you ever want to get rid of your unmanaged customizations, right click on the flow -> view solution layers -> select your unmanaged layer -> delete unmanaged customizations.
in your case you’ll only want to retrieve the URL so you won’t actually create a unmanaged customization layer.
