instance method process_immediate_variants_from_io

# File activestorage/app/models/active_storage/attachment.rb, line 192
    def process_immediate_variants_from_io(io)
      return unless blob.variable?

      named_variants.each do |_variant_name, named_variant|
        next unless named_variant.process(record) == :immediately

        blob.variant(named_variant.transformations).process_from_io(io)
        io.rewind if io.respond_to?(:rewind)
      end

      self.immediate_variants_processed = true
    end