User registration form

Hello

Congratulations for this plugin which seems very promising.
I didn’t find the information although I read some posts and watch somme videos about registration forms.
I created a form whose action = new user.
In the Fields tab you have to fill in some values.
I have chosen the value for ACF Fields and ACF field group.
In the User tab I have chosen a role and a manager user.
Then come the user fields and this is where I don’t understand. There are 2 choices: default field & custom ACF field.
I have tried the 2 choices (for custom ACF field of course I created the group and the fields) but it doesn’t record anything. In fact in the page created with Elementor by clicking on the Create button nothing happens.
I can’t find where is the problem.
I specify that I use the free version of the plugin.

Thanks in advance for your help.