attach image from Photogallery to email with MFMailComposeViewController

Question

I would like for user to choose their desired image from photo gallery and then that image is included in the email that they're are about to send.

I've already created a button that enables user to open gallery and then after choosing image it is displayed in UIImageView. However, my code that I have written in addAttachment I think is incorrect.

The UIImageViews name is imageView

button to open gallery

@IBAction func openPhotoLibraryButton(sender: AnyObject) {
    if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .photoLibrary;
        imagePicker.allowsEditing = true
        self.present(imagePicker, animated: true, completion: nil)
    }
}

Email code

@IBAction func sendEmail(_ sender: Any) {
    if MFMailComposeViewController.canSendMail() {
        let mail = MFMailComposeViewController()
        let emailFullName: String = fullName.text!
        let emailCell: String = cellNumber.text!
        let image1: UIImage = imageView.image!
        mail.mailComposeDelegate = self
        //Reciepient
        mail.setToRecipients(["kondja99@gmail.com"])
        // Email body
        mail.setMessageBody("FullName: \(emailFullName) \n Cellphone No: \(emailCell)"   , isHTML: false)
        // Subject
        mail.setSubject("Application for RTO: ")
        
        // Email attachment
        mail.addAttachmentData(Data, mimeType: "image/jpg", fileName: "\(image1)")
        self.present(mail, animated: true, completion: nil)
        }
     else {
        print("Email cannot be sent")
        
    }
}