Some FTP servers support the ability to resume an interrupted transfer. In order to enable this capability from the File Transfer control, invoke GetFile or PutFile with an additional, optional argument, which is a byte offset:

FileTransfer1.PutFile LocalFile, RemoteFile, Offset
FileTransfer1.GetFile LocalFile, RemoteFile, Offset

Starting at the specified Offset within the source file, transferred data will be appended to the target file. This feature should be used only for binary file transfers. For ASCII file transfers, this feature should not be used, due to the potential transformation of line termination characters (between Windows and UNIX systems, for example).

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