How to make the User registration form working, docs not clear

Hello

your docs are not clear for ACF User Front-end Submit Pro

I need to make a user registration

I added fields in ACF and setup the settings for user registration etc

then when I used [cats_user_regist group_id=”81″]

the ACF fields are shown

but nothing is ever save in Users data

DO we need to define specific ACF fields to copy User fields, email, username etc custom fields for this to work?

In this case what are the necessary files minimum required?

Thanks

Regards

In this case what fields with