title: Expo how to subscribe to FCM Channels
body: <blockquote>
    <p><a href="https://docs.expo.io/versions/latest/guides/push-notifications/" rel="nofollow noreferrer">https://docs.expo.io/versions/latest/guides/push-notifications/</a></p>
  </blockquote>
  
  <p>Following the docs I couldn't find a way to subscribe to a topic on fcm. I don't know if APN has topics like fcm. But if it does, it would be great to be able to subscribe to channels on both Android and iOS. Now the question is does expo support this behavior? For both Android and iOS or any?</p>