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It looks like this person might of found a solution.

Try this help thread.

Thank you, I had tried but it does not work. I even made an alert JS at the beginning of the function to see if he saw it, but apparently it does not use this file… If you have other ideas? Thank you anyway

I am sorry, I forgot to specify that I used a theme or the gallery was already implanted :
https://www.gt3themes.com/wordpress-themes/frame_light/

I am going to try to contact the designers of the theme.