ios：Google Drive REST API v3：内部错误500

Question

我在ios 10.1上使用Google Drive Rest API，并且能够列出文件元数据并获取文件内容。

当我尝试在appDataFolder中创建文件时，我收到内部错误500。我很感激您对此的见解。

这是我的代码：

     NSURL *url = [[ NSURL alloc ] initFileURLWithPath:filePath isDirectory:NO ];

     GTLRUploadParameters *uploadParameters = [ GTLRUploadParameters uploadParametersWithFileURL:url
                                                                                        MIMEType:mimeType];
     GTLRDriveQuery *query ;

     if (metadata == NULL)
     {
         metadata = [ GTLRDrive_File object ];

         metadata.name = fileName;

         if (folderId != NULL)
         {
             metadata.parents = @[ folderId ];
         }

         // This is a new file, instantiate an insert query.
         query =  [ GTLRDriveQuery_FilesCreate queryWithObject:metadata
                                              uploadParameters:uploadParameters ];
     }
     else
     {
         // This file already exists, instantiate an update query.
         query = [ GTLRDriveQuery_FilesUpdate queryWithObject:metadata
                                                       fileId:metadata.identifier
                                             uploadParameters:uploadParameters ];
     }

     query.fields = queryFileFieldsParam;

     [ weakSelf.googleDriveService executeQuery:query completionHandler:^(GTLRServiceTicket *ticket,
                                                                          GTLRDrive_File *updatedMetadata,
                                                                          NSError *error)
      {
          if (error == nil)
          {
              completionBlock(updatedMetadata);
          }
          else
          {
              NSLog(@"An error occurred: %@", error);

          }
      }];