Product Sizes & Variants in NINEMAGS

How they work, how to add new sizes, and what to avoid

In this guide, you’ll learn:

how product variants work in Shopify
how to correctly add new sizes
what limitations exist when using variants with NINEMAGS

How product variants work

In Shopify, variants are different versions of the same product

(for example: 1.5x1.5, 2x2, 3x3).

Each variant:

is selected by the customer on the product page
has its own settings in NINEMAGS
defines how many images the customer must upload

Important

NINEMAGS works on the variant level, not on the product as a whole.

How to add new sizes (variants)

Step 1. Add a variant in Shopify

Go to Products
Open the product you want to edit
In the Variants section, click on the existing variants

(for example: NINEMAGS Magnets or size labels like 1.5x1.5, 2x2, 3x3)

In the Option values field, add a new size
Click Done
Save the product

Why we do it this way

We do not click “Add another option”, because:

sizes should be values of one option, not a new option
“Add another option” creates a second option (for example, Color)

Step 2. Set price and inventory

In the Variants block, set:

price
inventory quantity

Step 2. Configure the variant in NINEMAGS (required)

After adding a new size in Shopify:

Go to Apps → NINEMAGS → Products
Click Select Product
Find the product in the list
Select the needed variant
Click Select
Check the required size and click Edit

Step 3. Edit variant properties

In the Edit properties window, fill in the required fields:

Required fields

Type: Button
Paper Size: Letter
Button Shape & Size:

must match the variant size

(for example: Square 2.5x2.5")
Upload amount:

number of images the customer must upload

Example: Upload amount = 4

Click Save in the edit window

Then click Save in the top-right corner of the page

(Shopify will show “Unsaved changes”)

Step 3. Check on the storefront

On the product page:

select the new size
click Upload pictures
make sure the number of upload slots matches your settings

⚠️ Limitations when working with variants

❌ You cannot add a variant only in Shopify

If a variant is:

added in Shopify
but not configured in NINEMAGS

➡️ the upload button may work incorrectly

➡️ the number of images may be wrong

➡️ order processing errors may occur

❌ Do not rename existing sizes without testing

Example:

2x2 → 2 x 2 inch

Why this is risky:

NINEMAGS may lose the connection to the variant
image upload may no longer match the correct size

❌ Avoid frequent changes to variant structure

Risky actions:

changing the option name
merging sizes
deleting active variants

📌 If the variant structure changes, you must recheck all NINEMAGS settings.

Recommended workflow

If you need to add or change a size:

Add or edit the variant in Shopify
Configure this variant in NINEMAGS
Check Upload amount
Test on the storefront

Quick summary (most important)

Each size = a separate variant
Each variant = a separate NINEMAGS configuration
Every new size requires setting Upload amount
Variant changes without testing are the #1 cause of errors