Large images not working properly

Hi everyone.

I have a problem with my "large" images. When I click on larger image in my product page I am only getting a small image.

My thumb nail photo is uploaded using admin. I then uploaded my medium and large images via my FTP.

Under images I have a folder named large and one named medium. Inside both these folders are the sub-folders for each category.

My medium images are showing up fine but when you click on larger image it's only small.

My files are named as followed:

Thumbnail: PI2023sml.jpg
Medium: PI2023med.jpg
Large: PI2023

They larger images did work but have stopped and I'm not sure why.

I also have images named like:

PI2023sml_01
PI2023med_01
PI2023_01

Can anyone help me with this. My large images should be showing up a lot larger then they are.

Here is a link to my site if this helps: http://passionsignite.com.au/zen-cart-v1.3.8a-full-fileset-12112007/

Thank you very much in advance for any and all help on this issue. I hope I have explained this well enough.

Your naming system is incorrect...

https://www.zen-cart.com/tutorials/index.php?article=224

... or you could install IMAGE HANDLER and just use ONE image - the large one..

Image Handler will create all the necessary thumbnails for you, offer a ZOOM feature if you want it, AND will clean up and optimize the picture quality...

It is a HUGE hassle-saver.