Dolphin ftp, show log files

Is it possible to see the ftp log for troubleshooting?

QT_LOGGING_RULES="kf.kio.workers.ftp.debug=true" dolphin

QT_LOGGING_RULES is the environment variable Qt/KDE apps can read logging configuration from.
kf.kio.workers.ftp is kde frameworks’ kio, ftp io worker, i. ftp handling.

One can use kdebugsettings to discover log options and turn then on.

I enabled all loging. no where can I see these?