title: How does HealthKit actually share data?
body: <p>On the Apple's HealthKit Framework official site it says that 
  "The HealthKit data is not saved to iCloud or synced across multiple devices. The data is only kept locally on the user’s device."</p>
  
  <p>If it's stored locally and never synced with a cloud then it means that I cannot share it with other users. But then Apple says that it's possible to share your data with your doctors as Epic and Mayo clinic are Apple's partners. How is this possible? 
  And also, how does the data come from wearable devices to the phone? 
  It's very confusing. </p>
  
  <p>I would be grateful if anyone could explain that because Apple and others basically say the same things and no one explains how that really works. </p>