ea3e118c8c
Related to: https://stackoverflow.com/questions/77268009/how-to-use-sftp-spring-integration-mput-with-sftpoutboundgateway-when-file-objec In some scenarios when the flow starts with a file inbound channel adapter and then an MPUT operation is performed for remote file outbound gateway, the populated in the beginning `FileHeaders.FILENAME` is used from the `DefaultFileNameGenerator` for all the files from local directory to upload. Such a behaviour leads only to the last file in the target remote directory and only with the name from that header. * Fix the `AbstractRemoteFileOutboundGateway` to remove a `FileHeaders.FILENAME` header when message is build for specific item from MPUT request. This way an original local file is used when we upload directory.