Cubic custom ISO which executes shell script at startup not working

I have tried this steps but not working

• First I have create a simple script in /opt/test.sh
• Then give execute permission for that file
• Create a test.desktop file in the following location /etc/xdg/autostart
• Generate a new ISO.
• Then I have install that iso on my VM the file not created as I wrote in the script file.

test.sh

#!/bin/bashtouch /opt/filecreated

test.desktop

[Desktop Entry]Type=ApplicationExec=/opt/test.shHidden=falseNoDisplay=falseX-GNOME-Autostart-enabled=trueName[en_US]=Test FileName=Test FileComment[en_US]=Test FileComment=Test File

Please help me to run a script file when install iso

Thank you