I need to add some fields to the shipping address form from checkout page, and then save them in db

[rlaa]

I built a module, but the custom checkout field is not saved in db and I don't know why?

Click here for download.

[OST Agency]

You can check this post, It might help you

https://ranasohel.me/2015/11/28/how-to-add-custom-field-to-shipping-address-form-in-magento-2-onepag...

[rlaa]

I checked that, but didn't helped me, that module is not saving custom fields in the database, only shows them up in frontend.

[rlaa]

I didn't solve the problem, after I installed this module, the custom checkout field shows up in both front end and admin address form, but it is saving in the db only from admin panel, I need to be able to save it also from the front end.

I think the problem appears when I click the next button from checkout page, custom checkout field is not sent in post data request.