Alchemy error reading S3 images

[Maria Jose Gonzalez Antelo]

I have integrated alchemy in heroku with s3, I can upload images in my bucket S3, but I don't know why trying to display them in alchemy/admin/images don't find them.

This is my alchemy_s3.rb

if Rails.env.production?

    require 'dragonfly/s3_data_store'

    pictures_app = Dragonfly.app(:alchemy_pictures)

    pictures_app.configure_with(:imagemagick)

    pictures_app.configure do

      verify_urls false

      datastore :s3,

        bucket_name: ENV.fetch("AWS_PICTURES_DIRECTORY"),

        access_key_id: ENV.fetch("AWS_ACCESS_KEY_ID"),

        secret_access_key: ENV.fetch("AWS_SECRET_ACCESS_KEY"),

        url:            ':s3_domain_url',

        region: ENV.fetch("AWS_REGION"),

        storage_headers: {'x-amz-acl' => 'public-read'},

        url_scheme: 'https'

    end

    attachments_app = Dragonfly.app(:alchemy_attachments)

    attachments_app.configure do

      verify_urls false

      datastore :s3,

        bucket_name: ENV.fetch("AWS_ATTACHMENTS_DIRECTORY"),

        access_key_id: ENV.fetch("AWS_ACCESS_KEY_ID"),

        secret_access_key: ENV.fetch("AWS_SECRET_ACCESS_KEY"),

        region: ENV.fetch("AWS_REGION"),

        url:         ':s3_domain_url',

        storage_headers: {'x-amz-acl' => 'public-read'},

        url_scheme: 'https'

    end

end