Flatpak app does not appear in app menu

I installed Flatpak:

sudo apt update
sudo apt -y install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
sudo apt -y install gnome-software-plugin-flatpak

Then installed MakeMKV by clicking the Install button here, Software opens and I installed it (source shown was flathub, to confirm I am getting the flatpack version):

But the app does not show up in the Budgie App Menu. I have to launch it via Software.

My only goal is to copy a DVD to a single file that is supported by webbrowsers, without transcoding A/V. MakeMKV seems to get close but only supports MKV, which is not supported by most browsers but I figure I can convert it to a different container like webM or MP4 afterwards.

what is the file location of the makemkv .desktop file - /usr/share/applications?

What is the content of that .desktop file?

Ah well, there is no .desktop file in /usr/share/applications or $HOME/.local/share/applications :frowning:
Is this the fault of the MakeMKV app itself (does its dev need to configure it) or should this be created Flatpak?

I’m not familiar with MakeMKV. Is it a terminal based application? If it is then that may explain why the application developer / flatpak hasn’t created a .desktop file - i.e. graphical based apps appear in a menu usually (not always).

Found this interesting flatpak/menu thread Flatpak doesn't automatically create application menu entry anymore? · Issue #2886 · flatpak/flatpak · GitHub

It mentions XDG_DATA_DIRS environment variable and that the flatpak .desktop file needs to be in a location pointed to by XDG_DATA_DIRS.

Another poster also mentioned rebooting resolved matters.