@Bean
  @ServiceActivator(inputChannel = "toSftpChannel")
  public MessageHandler handler() {
    final SftpMessageHandler handler = new SftpMessageHandler(sftpSessionFactory());
    handler.setRemoteDirectoryExpressionString("'" + properties.getFolder() + "'"
        + ".concat(headers['region'])");
    handler.setAutoCreateDirectory(true);
    return handler;
  }

MessageDeliveryException: Failed to transfer file [/test/home-dir/feed.xml -> feed.xml] from local directory to remote directory.; nested exception is org.springframework.core.NestedIOException: failed to create remote directory '/test-sftp'.; nested exception is 4:
    at org.springframework.integration.file.remote.RemoteFileTemplate.doSend(RemoteFileTemplate.java:347)
    at org.springframework.integration.file.remote.RemoteFileTemplate.lambda$send$0(RemoteFileTemplate.java:298)
    at org.springframework.integration.file.remote.RemoteFileTemplate.execute(RemoteFileTemplate.java:437)
    at org.springframework.integration.file.remote.RemoteFileTemplate.send(RemoteFileTemplate.java:298)
    at org.springframework.integration.file.remote.RemoteFileTemplate.send(RemoteFileTemplate.java:286)
    at org.springframework.integration.file.remote.RemoteFileTemplate.send(RemoteFileTemplate.java:278)
    at org.springframework.integration.file.remote.handler.FileTransferringMessageHandler.handleMessageInternal(FileTransferringMessageHandler.java:205)