It took me a while but I figured out zen cart’s way of dealing with product images. It’s all about how you name the first product image you upload.
Add your product and make all the necessary adjustments to the product features.Then when it comes to uploading the initial image name it like this:
product.jpg. Then with filezilla or whatever ftp you use load up your additional images:
product1.jpg
product2.jpg
product3.jpg
Simple,right?
Except when I went to the help pages on the zen cart website no one explained it like that!
I was adding images by ftp not knowing why they wouldn’t show up on the product page and then trying out all different combos of names or directories. Nothing helped. Until I loaded a new product and accidentally did it right. Because if you upload product1.jpg as your first product image- loading product2.jpg, product.jpg and product3.jpg will result in no extra images showing up.
Some of the zen cart help articles tell you that zen cart will display on the product page any image that has a similar name as the first image you uploaded in the actual description of the product. I didn’t find this to be true. I also didn’t find the use of the extension_LRG or _MD to do anything either. It also didn’t seem to matter to what directory I uploaded the product images. If the product images weren’t uploaded in the right sequence with the right name-the extra images wouldn’t be displayed.
Hope this helps someone else.