There is any simple way in Magento2 to add custom field to Checkout? I have displayed my custom field in shipping address following by StackOverFlow tips and Magento docs. Unfortunally, Magento docs doesn't have info how to save this attribute to database.
I have moved my attributes from custom_attributes to extension_attributes, but values still is not saved in customer shipping address.
Can You give me tip how I should save my new field in custom attributes in shipping address in Customer details?