Firebase方法返回未知错误

Question

我正在尝试使用iOS版Firebase SDK将数据发送到Cloud Storage。为此，我以这种方式创建了一个引用（StorageReference）：

let storageRef = Storage.storage().reference(forURL: Config.CONFIG_ROOF_REF).child("Posts").child(videoIDString)

并使用putFile方法：

storageRef.putFile(from: videoURL, metadata: nil) { (metadata, error) in
            if error != nil{

                ProgressHUD.showError(error?.localizedDescription)
                              return
                      }
                          storageRef.downloadURL(completion: { (url, error) in
                              if error != nil {
                                  return
                              }else {
                                  self.videourl = url?.absoluteString
                                  onSuccess(videourl!)
                              }

            })
        }

我传入了参数videoURL，然后收到错误消息：

An unknown error occurred, please check the server response

我无法理解为什么收到此错误，因为我传递的videoURL似乎合法。

我要传递的videoURL是这个：

file:///Users/andreagualandris/Library/Developer/CoreSimulator/Devices/7D3329AC-AD8D-4553-AC61-FDF8435134B6/data/Containers/Data/PluginKitPlugin/8229E521-A7A2-4C09-8312-CC6106C2FED8/tmp/trim.7CC60B3A-6982-4F42-AA63-ED094288A562.MOV

所以我认为这是一个普通的URL，应该没有任何问题。

控制台上的实际服务器响应是：

2020-01-26 10:31:27.107215+0100 InstagramClone[2517:235684] Task <4AC8F3F2-1CC6-4064-BBF7-6D0375769C9A>.<1> finished with error [-1] Error Domain=NSURLErrorDomain Code=-1 "unknown error" UserInfo={NSErrorFailingURLStringKey=https://firebasestorage.googleapis.com/v0/b/instagramclone-1ed36.appspot.com/o/Posts%2F412BA396-6CAD-4197-817F-1AA0D9E6E6FE?uploadType=resumable&name=Posts%2F412BA396-6CAD-4197-817F-1AA0D9E6E6FE&upload_id=AEnB2UoAHEWQ0WDv_Id2TK_xSL_71Jrj8kbmuDfLpGkO8fBe6e9sBF74QUj5r0MLdltJN79z5fWAtoqOx8JSAfpppyPe6qKrxA&upload_protocol=resumable, NSErrorFailingURLKey=https://firebasestorage.googleapis.com/v0/b/instagramclone-1ed36.appspot.com/o/Posts%2F412BA396-6CAD-4197-817F-1AA0D9E6E6FE?uploadType=resumable&name=Posts%2F412BA396-6CAD-4197-817F-1AA0D9E6E6FE&upload_id=AEnB2UoAHEWQ0WDv_Id2TK_xSL_71Jrj8kbmuDfLpGkO8fBe6e9sBF74QUj5r0MLdltJN79z5fWAtoqOx8JSAfpppyPe6qKrxA&upload_protocol=resumable, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "BackgroundUploadTask <4AC8F3F2-1CC6-4064-BBF7-6D0375769C9A>.<1>"
), _NSURLErrorFailingURLSessionTaskErrorKey=BackgroundUploadTask <4AC8F3F2-1CC6-4064-BBF7-6D0375769C9A>.<1>, NSLocalizedDescription=unknown error}