You may need a rake task to run on the blobs. In the Rails console, look up a Blob that was uploaded.

ActiveStorage::Blob.first.service_name

It will likely return something like

local

Whatever you have set for the name in the storage.yml will be what you need to set for the service_name. You can bulk update this with something like

ActiveStorage::Blob.update_all(service_name: 'contabo')

Where, in this example, contabo would be the top level key name of the service in the storage.yml.