I was trying to add the Postman app to my Gnome favourite bar, but right clicking it doesn’t give me the option to add it as a favourite.

Apparently if your application is not seen as an Activity then it can’t be added. Usually I’d just create a .desktop file and use that with a launcher. But Gnome doesn’t really work like that.

I found the answer was to create my .desktop file and then copy/move it to /usr/share/applications or if it is a user specific application ~/.local/share/applications.

$ gnome-desktop-item-edit ~/Desktop/ --create-new
$ sudo mv ~/Desktop/Postman.desktop /usr/share/applications 

Then I can use the “Activities” to search for the app and can now add it as a favourite.