Using just installed Manjaro 20.04 KDE, fully updated.
The problem is, I can't attach / upload files with non-English (Russian) names via chromium-based browsers. Tested Chrome, Chromium, Brave. I get "This file is 0 bytes, so it will not be attached" error.
Everything's fine when using Firefox. Searched the web for solutions, no luck. On the surface everything seems OK, I checked /etc/locale.conf and /etc/locale.gen, which look normal, switched my locale settings from English to Russian and back. Looks like my skills are not yet sufficient to diagnose the encoding issues on my own.
Below is the output of
en_US.UTF-8 UTF-8 ru_RU.UTF-8 UTF-8