I’m running Etcher on CachyOS. When I click on Flash from file, nothing happens. The error I see in the terminal is [3616:0927/<random numbers>:ERROR:components/dbus/xdg/request.cc:169] Request ended (non-user canceled).
It sounds like Etcher is having trouble communicating with your OS “file picker.” Does dragging and dropping the file you want to flash directly onto Etcher work?