What would you do if Dropbox uploads were down 50%?

My first step would be to thoroughly investigate the situation by gathering more data. I'd clarify the exact definition of 'uploads' and the timeframe for this 50% drop. Then, I would explore potential root causes, such as technical issues (server problems, bugs), user-facing problems (UI changes, new feature confusion), external factors (competitor actions, network outages), or changes in user behavior. Once potential causes are identified, I'd prioritize the most likely ones based on available data and propose targeted solutions. Finally, I'd establish clear metrics to track the effectiveness of implemented solutions and ensure uploads return to expected levels.