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FTPS: Resume broken file transfer
If the transfer has been broken, you can track this and resume transfer in the next transfer attempt. To do this set Mode parameter of the Upload* or Download* method, that you use, to Resume. In this case, the transfer will be resumed from the place, in which it has been interrupted.
Also UploadStream(), UploadFile() and DownloadStream, DownloadFile methods have RestartFrom parameter, that can be used to specify the starting point of the upload or download operation.
