Why am I getting an error with UIImageRepresentation with 2 different strings?

Question

So when I only have the myImageView1 in its fine but why is it giving me an error when I add myImageView2 in next to it separated by a comma. The error is at the uploadData part. How do I fix this?

@IBAction func upload(_ sender: Any) {


    let storageRef = Storage.storage().reference().child("images/\(NSUUID().uuidString)/image.png")
    if let uploadData = UIImagePNGRepresentation(self.myImageView1.image!){

        storageRef.putData(uploadData, metadata: nil, completion: { (metadata, error) in
            if error != nil {
                print("error")
                return
            }


            else {
                let downloadURL = metadata?.downloadURL()?.absoluteString
                self.ref?.child("Posts").childByAutoId().setValue(["Download URL": (downloadURL), "Download URL 2": (downloadURL2)])


            }

Answer 1

From the declaration of UIImagePNGRepresentation :

func UIImagePNGRepresentation(_ image: UIImage) -> Data?

This function only takes one argument. You will need to get their data separately and find a way to combine them into one Data object.