Order Attributes User Guide

Mageplaza Order Attributes extension allows admins to add custom fields to the checkout page. It helps the store owner to easily collect more information and increase customer satisfaction. This module provides a variety of custom fields such as Text Field, Text Area, Date, Yes/No, Dropdown, Single-select With Image, Multiple Select with Image, Single File Attachment, Content. 

This is the User Guide: https://docs.mageplaza.com/order-attributes/index.html