How can I add an item to the Gnome 3 menu?

[Paddy Landau]

EDIT: It's suddenly started to work!

I've tried following the instructions found on the 'net, but I can't get the following to work.

I have Ubuntu 20.04, and a script that I've written.

I want the script to be available from the normal Gnome 3 menu (when you press the Super key and start typing the name, or press the Applications button) — but it must be available to all users, not just me.

Here's what I've done.

1. Create the script (named test) to start a GUI application. Save this script to /usr/local/sbin/test. I've given read and execute permissions to everyone.
2. Create a .desktop file for the item, which I've put into /usr/share/applications/test.desktop. The contents are as follows.
   

   [Desktop Entry]
   Name=Test
   Comment=This is a foobar test
   Keywords=foobar;
   OnlyShowIn=GNOME;Unity;
   Exec=/usr/local/sbin/test %u
   Icon=/usr/share/icons/test.png
   StartupNotify=true
   Terminal=false
   Type=Application
   StartupWMClass=ApplicationName
   Categories=Utility;

3. I've tested that the script works:
   

   /usr/local/sbin/test

Now, even after I restart, when I press the Super key, I search for my app using the keyword "test" (from the Name) or "foobar" (from the Keywords), but neither returns the result. How can I fix this, please?