The missing files are likely assets, so you need the rake task that pushes those to s3 (s3:upload_assets – it’s near the top)
But your errors are likely due to the new aws s3 library breaking a bunch of services. So you’ll need to contrive to downgrade the aws gem or use another service.
I think there may be a topic about how to do that. I’ve done it on a site or two, but am not sure how or where it’s been documented