Been meaning to check out Lume! Gonna take a look right now. I see you provide a flatpak - even considered submitting it to Flathub?
Hi, If you want to use Lume on Linux, you can use v3 and below. v4 is not support Linux yet, I will add support for Linux when macOS version is stable And flatpak version only work well with GNOME, because it require gnome-keyring Flathub is on my roadmap too.