module ActivoRails
  class Engine < Rails::Engine
    puts "Loaded engine"
    config.asset_path = "/activo/%s"
  end
end

module ActivoRails
  class Engine < Rails::Engine
    initializer "static assets" do |app|
      app.middleware.use ::ActionDispatch::Static, "#{root}/public"
    end
  end
end

Make sure static content is loaded
Make sure static content is loaded
