I, also didn’t have mucus or coughing but I do have some now that I’m using the Ohtuvayre and Lavalbuterol in nebulizer. Ohtuvayre has given me a bit of energy, which I badly needed.
Having worked as a nursing assistant for over 20 years I was also surprised at the number of people with COPD that were not aware they need to breathe from the stomach and not the chest. It’s pretty easy to tell , place one hand on stomach and other on chest. Chest and shoulders should not move.