"DuplicateFile" method fails with "Operation not supported"

Hello

I am using the .NET assembly of WinSCP 5.13.1 (Build 8265) from PowerShell on Windows 10.

I have followed the good and detailed descriptions in the WinSCP web site for using the assembly in PowerShell. But unfortunately, the DuplicateFile method is generating an exception, when I try to call it. More specifically, I get the following error message:

Exception calling "DuplicateFile" with "2" argument(s): "Operation not supported."

I specified a session log file in my script, from where I see a similar entry:
I have no problems downloading the file, then uploading it to the destination folder. But I would really like to avoid this.

For the record, I also have no problem using the MoveFile method on the same file and folders.

Please advise.
Best regards,
Neilsean Lavlund Victorino

What protocol are you using?

Please attach a full session log file showing the problem (using the latest version of WinSCP).

Hello
Thank you for the quick response.
I am using the FTP protocol, which can be seen in the attached session log file.

best regards
Neilsean Lavlund Victorino

Your FTP server does not support duplicating files.
See also https://winscp.net/eng/docs/protocols#duplicate

That explains it all!
I wasn't aware of that prerequisite.
Thank you very much for your help!

best regards
Neilsean Lavlund Victorino