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如果你碰巧像我一样只能访问Rails控制台，这个解决方案工作得很好。如果您将此代码复制粘贴到控制台，它将开始生成S3上传的输出。5K之后，我就完了。非常感谢Tayden的解决方案。

all_services = [ActiveStorage::Blob.service.primary, *ActiveStorage::Blob.service.mirrors]

    # Iterate through each blob
    ActiveStorage::Blob.all.each do |blob|

      # Select services where file exists
      services = all_services.select { |file| file.exist? blob.key }

      # Skip blob if file doesn't exist anywhere
      next unless services.present?

      # Select services where file doesn't exist
      mirrors = all_services - services

      # Open the local file (if one exists)
      local_file = File.open(services.find{ |service| service.is_a? ActiveStorage::Service::DiskService }.path_for blob.key) if services.select{ |service| service.is_a? ActiveStorage::Service::DiskService }.any?

      # Upload local file to mirrors (if one exists)
      mirrors.each do |mirror|
        mirror.upload blob.key, local_file, checksum: blob.checksum
      end if local_file.present?

      # If no local file exists then download a remote file and upload it to the mirrors (thanks @Rystraum)
      services.first.open blob.key, checksum: blob.checksum do |temp_file|
        mirrors.each do |mirror|
          mirror.upload blob.key, temp_file, checksum: blob.checksum
        end
      end unless local_file.present?

因为你已经在轨道6上了。1、可以使用#mirror_later。它将使后台工作进程入队以镜像到已配置的服务。

ActiveStorage::Blob.find_each do |blob|
  blob.mirror_later
end

参考： www.example.com