How to migrate files from local persistent storage with CarrierWave correctly?

Initially, the application used local persistent storage. I tried moving the entire uploads directory into ImageKit. I kept the previous configuration and added a new one from ImageKit:

class BaseUploader < CarrierWave::Uploader::Base
  include ImageKitIo::CarrierWave

  def store_dir
    full_file_path
  end

  # ...

  def options
    {
      response_fields: "isPrivateFile, tags",
      tags: %w[images],
      use_unique_file_name: false,
      folder: full_file_path
    }
  end

  private

  # ...

  def full_file_path
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{dirs}"
  end

  # ...
end

As a result I get this error:

unexpected token at 'f1843b5f9.jpg'

From this line:

= image_tag band.card_image.url

In this case, the full name of the file in the database is: 9757131f1843b5f9.jpg.

Please tell me what else needs to be done to migrate files?

Start with the BaseUploader configuration and the image_tag band.card_image.url call shown in the issue. Reproduce the failure using the existing database filename and inspect the CarrierWave/ImageKit migration and URL-handling documentation; done means migrated files can be resolved and rendered without the reported error.