transform_variants_later

# File activestorage/app/models/active_storage/attachment.rb, line 134
    def transform_variants_later
      preprocessed_variations = named_variants.filter_map { |_name, named_variant|
        if named_variant.preprocessed?(record)
          named_variant.transformations
        end
      }

      if blob.preview_image_needed_before_processing_variants? && preprocessed_variations.any?
        blob.create_preview_image_later(preprocessed_variations)
      else
        preprocessed_variations.each do |transformations|
          blob.preprocessed(transformations)
        end
      end
    end