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Try putting the .desktop file under Home  / .local / share / applications

The ".local" is a hidden file in your home directory, so press control + H

My .desktop looks like this ( I have saved the Left Application files into my Downloads Folder):

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Terminal=false
Exec=/home/halpin/Downloads/left/Left.sh
Name=Left
Icon=/home/halpin/Downloads/left/resources/app/icon.png