StorageReference.downloadURL返回com.google.android.gms.tasks.zzu@c04d1e6，而不是实际的下载URL

Question

StorageReference.downloadURL返回com.google.android.gms.tasks.zzu@c04d1e6，而不是返回 downloadURL 。内容正在上传，但下载URL错误。这是我的代码：

val imageTBP: Uri = Uri.fromFile(argument)
val storageRef = storage.getReference().child("images").child(imagetbpname)
val uploadTask = storageRef.putFile(imageTBP)
uploadTask.addOnFailureListener(OnFailureListener{
    Toast.makeText(this, "Upload Failed", Toast.LENGTH_SHORT).show()
}).addOnSuccessListener(OnSuccessListener<UploadTask.TaskSnapshot>{
    val downloadURL = storageRef.downloadUrl
    Log.i("URL", downloadURL.toString() )