headers_for_direct_upload

# File activestorage/lib/active_storage/service/s3_service.rb, line 94
    def headers_for_direct_upload(key, content_type,, checksum,, filename: nil, disposition: nil, custom_metadata: {}, **)
      content_disposition = content_disposition_with(type: disposition, filename: filename) if filename

      { "Content-Type" => content_type, "Content-MD5" => checksum, "Content-Disposition" => content_disposition, **custom_metadata_headers(custom_metadata) }
    end