upload

# File activestorage/lib/active_storage/service/s3_service.rb, line 28
    def upload(key, io, checksum: nil, filename: nil, content_type: nil, disposition: nil, custom_metadata: {}, **)
      instrument :upload, key: key, checksum: checksum do
        content_disposition = content_disposition_with(filename: filename, type: disposition) if disposition && filename

        if io.size < multipart_upload_threshold
          upload_with_single_part key, io, checksum: checksum, content_type: content_type, content_disposition: content_disposition, custom_metadata: custom_metadata
        else
          upload_with_multipart key, io, content_type: content_type, content_disposition: content_disposition, custom_metadata: custom_metadata
        end
      end
    end