Some apps not showing on Flameshot "Open With" dialog

[CarterSnich]

I use nsxiv as my image viewer on my EndeavorOS. It doesn't show up as an option under Graphics (also when searched). So, I thought of creating one, since it doesn't have one after installing. But, still not showing under Graphics. Is it something hard coded on Flameshot, or there is a config that lists only recognized apps?

.desktop

[Desktop Entry]
Version=1.1
Type=Application
Name=nsxiv
Comment=Neo (or New or Not) Simple (or Small or Suckless) X Image Viewer
Icon=nsxiv
Exec=/usr/bin/nsxiv
Actions=
Categories=Graphics;

Flameshot "Open With" dialog

MenuLibre nsxiv entry

Flameshot v12.1.0 (-)
Compiled with Qt 5.15.10