The module can pass a product size to PrestaShop to allow it to display the available carriers for a specific customization.
To achieve this, you need to give your fields specific names if needed. Here is the list of field names:
If your fields unit is cm the use the following names
height, width, depth
If your fields unit is meters the use the following names
height_m, width_m, depth_m
If your fields unit is mm the use the following names
height_mm, width_mm, depth_mm
When the module find a field that has one of these name, it will pass the value of the field to the corresponding product property.