FAQ
General Instruction
Product matrix is not displayed in store on product page, what should I do?
Make sure app is enabled from general settings. If the productmatrix is still not showing, then make sure at least one option is added for that product.
I have enabled "Allow out of stock" from general settings, still the cart is empty when I try to add products more than stock quantity, why is that so?
You need to enable "Allow customers to purchase this product when it's out of stock" option from shopify backend. See Example.
How do I change the default designing of productmatrix to match with my theme?
You can make use of existing design settings in dashboard/general settings, or you can also add "additional css" from general settings.