Sorry, but still not getting anywhere with this so I have posted a photo of the screen I get when I press the shutter button after starting the script . go to
https://flic.kr/s/aHBqjzKt4M
In your video
https://flic.kr/p/2ndYdnf at the very start when you turn on the camera, the motion detection grid is showing, indicating a script is running. However, the camera appears to still be in playback mode, so it can't shoot. Do you have Autostart on in the script options? If so, turn it off.
The still image shows the alt mode help screen, which by default appears after 3 seconds in alt mode when no script is running.
In general
* When in alt and no script is running, fully pressing the shutter starts the script
* If a script is running, fully pressing it ends the current script
If the script is one that shoots, you should usually switch to shooting mode before starting the script, though some scripts will do it for you.