CarrierWave Backgrounder不会将版本映像上传到AWS S3

I was using carrierwave 0.10.0 gem with RMagic to upload images on AWS S3. Everything was working fine except it was taking too much time to upload on AWS S3. So thought using carrierwave backgrounder to upload images in background. I set up carrierwave backgrounder (0.4.2) but In this one My original file is always get upload to S3 but versions of that image is never gets uploaded on S3. I was using carrierwave 0.10.0 gem with RMagic