Since 5.14, it is always possible to use drag&drop to move remote files to external applications, while copy is always the default operation.
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Thanks for your feedback.
Regarding the move: Are you sure this is a new problem? Didn't you have this problem before?
Would disabling "Allow moving from remote directory to other applications" help?
I have released WinSCP 5.13.2 with a workaround for a problem you have reported.
Can you please test it?
I appreciate any feedback.
Thanks for your report.
This issue has been added to the tracker: