PHOTO UPLOAD 버튼을 눌러도 반응이 없습니다.

파이어베이스 스토리지에 업로드가 안되는걸로 봐선 사진 업로드 버튼을 눌러도 작동하지 않는것 같습니다. 혹시 사진이 업로드 되는데 시간이 오래 걸리는지요. 작성한 코드는 맞는 것 같은데 반응이 없네요.

class AddPhotoActivity : AppCompatActivity() {
    var PICK_IMAGE_FROM_ALBUM = 0
    var storage : FirebaseStorage? = null
    var photoUri : Uri? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_add_photo)

        storage = FirebaseStorage.getInstance()

        var photoPickerIntent = Intent(Intent.ACTION_PICK)
        photoPickerIntent.type = "image/*"
        startActivityForResult(photoPickerIntent,PICK_IMAGE_FROM_ALBUM)

        addphoto_btn_upload.setOnClickListener{
            contentUpload()
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if(requestCode == PICK_IMAGE_FROM_ALBUM){
            if(resultCode == Activity.RESULT_OK){
                //This is path to the selected image
                photoUri = data?.data
                addphoto_image.setImageURI(photoUri)

            }else{
                //Exit the addPhotoActivity if you leave the album without selecting it
                finish()
            }
        }
    }
    fun contentUpload(){

        var timestamp = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
        var imageFileName = "IMAGE_" + timestamp + "_.png"

        var storageRef = storage?.reference?.child("images")?.child(imageFileName)

        //FileUpload
        storageRef?.putFile(photoUri!!)?.addOnSuccessListener {
            Toast.makeText(this, getString(R.string.upload_success), Toast.LENGTH_LONG).show()
        }
    }
}