title: How to upload multiple image on firebase using swift?
body: <p>I just want to upload multiple image on firebase using swift. I am now uploading one image but unable to upload multiple image. Here is my code</p>
  
  <pre><code>let photoIdString = NSUUID().uuidString
  let storageRef = Storage.storage().reference(forURL: Config.STORAGE_ROOF_REF).child("posts").child(photoIdString)
  storageRef.putData(imageData, metadata: nil,completion: {(metadata,error) in
  
         if error != nil {
              return
         }
         let photoUrl = metadata?.downloadURL()?.absoluteString
         let ref = Database.database().reference()
         let postReference = ref.child("posts")
         let newPostId = postReference.childByAutoId().key
         let newPostReference = postReference.child(newPostId)
         newPostReference.setValue(["photoUrl":photoUrl,"caption":self.textView.text!]) 
  </code></pre>