How to permit a new param with devise for active storage?

Question

I'm on the latest version of devise 4.6.1, with rails 5.2. Whitelisting params in the application controller doesn't work for some reason. This code is taken directly from the documentation, I'm at a loss as to why this isn't working.

Application_controller:

class ApplicationController < ActionController::Base
 # protect_from_forgery with: :exception
  before_action :configure_permitted_parameters, if: :devise_controller?
  before_action :channel_variable

    def channel_variable
    @channels = Channel.all.order('created_at desc')
    end

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:account_update, keys: [:avatar])

    devise_parameter_sanitizer.permit(:sign_in, keys: [:avatar])

    devise_parameter_sanitizer.permit(:sign_up, keys: [:avatar])
  end
end

Console:

Unpermitted parameter: :avatar

edit.html.erb:

      <%= simple_form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f| %>
        <%= f.error_notification %>

          <div class="field">
            <div class="control">
              <%= f.label :avatar %>
              <%= f.file_field :avatar %>
            </div>
          </div>
<% end %>

Answer 1

I've found it best to create a separate route and UsersController to modify User attributes outside of authentication, including Active Storage attachments. You'd want to create a users#update method and whitelist your avatar param there. This is a bit dated but the accepted answer is the basically the approach you'd take:

Rails: Devise: How can I edit user information?