以下内容将有所帮助：

# signed URL with expiration
rails_blob_path(user.avatar, disposition: "attachment", expires_in: 10.minutes)

# or

# set a default expiration time in config/application.rb
module Blog
  class Application < Rails::Application
    config.active_storage.urls_expire_in = 30.minutes
  end
end

更多详情，请访问here