Previously (when ~1-2 years ago) drag and drop of a file from (say kmail) to konsole would copy the file form the source to the CWD of the shell - this was really rather handy. A few updates ago this behaviour stopped and you simply dragged the filename of the temp file across - not nearly so nice but usable. I had high hopes this would be fixed in the latest version but it isn't. It's mildy irritating to have to warp to the beginning of the line type "cp " and then warp to the end to type " .<return>" - I suppose there might be a good reason to do this but I can't think of it. I suppose there might be an option in konsole, kmail or plasma to control this but I can't find one. Anyway - please revert to the previous behaviour of dragging and dropping files into the CWD - it was really useful.
There's a profile configuration for this behavior at Mouse→Miscellaneous→Disable drag & drop menu for files & URLs. It is checked by default, it should be unchecked for the behavior you want. The default was changed in 2018 (https://phabricator.kde.org/D12529?id=33116).
Fabulous! thanks!