s3upload.js

<script>
    $(function(){
      $('#edit').froalaEditor({
        enter: $.FroalaEditor.ENTER_P,
        fileUploadToS3: {
          bucket: '<?php echo $bucket; ?>',
          region: '<?php echo $region; ?>',
          keyStart: '<?php echo $keyStart; ?>',
          params: {
            acl: '<?php echo $acl; ?>',
            AWSAccessKeyId: '<?php echo $accessKeyId; ?>',
            policy: '<?php echo $policy; ?>',
            signature: '<?php echo $signature; ?>',
          }
        }
      })
      .on('froala.file.uploadedToS3', function (e, editor, link, key, response) {
        console.log ('S3 Link:', link);
        console.log ('S3 Key:', key);
      })
    });
  </script>