Cannot view multiple images on website

Unless you provide a link to a page demonstrating the problem, no one will be able to offer much in the way of assistance.

Thank you – please see below (wall light). I have uploaded two images for this – only one displays on my webpage.

https://www.adfixironmongery.co.uk/?wpsc-product=hall-stand-hat-coat-hook-cast-iron-heavy-beeswax-finish-10-duplicate

And what happens if you are not using an ecommerce plugin?

I am not sure how site is set up in relation to plug-ins – this was done some time ago by a local company.
I may have to be satisfied with ‘inserting image into post’ for now – not ideal but at least the image can be seen next to the main one.
Many thanks
Paul