Unable to Upload Files with Korean Characters in the Filename

We recently updated our WinSCP from 6.3.6 to 6.5.3 and get the following error message when attempting to upload a file with Korean characters in the filename:

Permission denied
Error Code: 3
Error message from server: Permission denied

We rolled back to version 6.3.6 and confirmed we could upload the files with no issues. We're using SFTP and connecting to an OpenFTP server on the distant end.

I've tried changing the UTF-8 encoding for filenames from Auto to On, and forcing it to use SFTP version 3, and also disabled the transfer to temporary file name option but I can't get it to work.

Thanks for any guidance.

Thanks for your report. Please attach a full session log files from both versions of WinSCP showing upload of the same file. Use log level Debug 2.

We got it working on the new version by forcing it to use SFTP v6.

Thanks!

Ok, and were you forcing the SFTP 6 with the old version too?
Or did it work with the default settings?
If it did work with the default settings, I'd still appreciate if you can post the logs.