SUMMARY
When you double-click an FTP file, it does as if it was a folder, so when opening ftp://..../a.txt , you get into a non-existing folder ftp://..../a.txt in which you can see a.txt again, but now after a double-click it says that a.txt dosn't exist "550 Unknown error 187". When copying/pasting a.txt in a second dolphin Window (not tab) that is not ftp, let's say downloads, it creates a folder named a.txt and gives you an error message "unable to write in the file".


STEPS TO REPRODUCE
1. Open an FTP connection
2. Create a file
3. Double-click on it

OBSERVED RESULT
see attachment

EXPECTED RESULT
opening a.txt with the default .txt editor (kate in my case)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux (x86_64) release 5.13.11-1-MANJARO
KDE Plasma Version: 5.22.44
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2