I made an override for items on my template (we use Helix Ultimate) to /templates/shaper_helixultimate/html/com_spsimpleportfolio/items.
I use unique item override too, this working, but items override not. I changed Zoom URL to thumbnail image, but nothing happened. Anything modify on file, nothing...

I attached my edited line, zoom is disabled now by css.
Why not see my override for Items? I have not any cache, or optimization on our website (https://ggabyart.com/art) while developing.