When a user is online, all data associated with the group channels they are a member of are automatically updated. However, when a user is disconnected from the Sendbird server and reconnects later, the
refresh() method should be called to update the user's group channels with the latest information.
Note: If you want to provide the updated channels with the latest information when your user's app is in the foreground, call the
refresh()method within the
onReconnectSucceeded()property which receives a callback from the Sendbird server when successfully reconnected.