Files uploading but at zero bytes size

[MorenoMdz]

const multerOptions = multer({
  storage: imager({
    accessKeyId: process.env.AWS_ACCESS,
    secretAccessKey: process.env.AWS_SECRET_KEY,
    bucket: process.env.AWS_BUCKET,
    region: process.env.AWSregion,
    /*acl: 'public-read',
    // Auto detect contet type
    contentType: multerS3.AUTO_CONTENT_TYPE, */
    dirname: 'images',
    filename: function(req, file, cb) {
      const extension = file.mimetype.split('/')[1]; // gets the extension
      const area = 'test_';
      const fileName = `${area}${uuid.v4()}.${extension}`;
      console.log('file name is ', fileName);
      cb(null, fileName);
    },
    gm: {
      pool: 5,
      format: 'png',
      scale: {
        width: 200,
        height: 200,
        type: 'contain',
      },
      crop: {
        width: 200,
        height: 200,
        x: 0,
        y: 0,
      },
      rotate: 'auto',
    },
   **// This part is not being executed.**
    fileFilter(req, file, next) {
      const isPhoto = file.mimetype.startsWith('image/');
      console.log(req.files);
      if (isPhoto) {
        next(null, true); // null for error means it worked and it is fine to continue to next()
        console.log(isPhoto);
      } else {
        next({ message: 'Fotos: Tipo de arquivo não suportado!' }, false); // with error
      }
    },
    s3: {
      Metadata: {
        ACL: 'public-read',
        customkey: 'data',
      },
    },
  }),
});

exports.upload = multer(multerOptions).array('photos', 5);

Files are going to S3 with the right name but at zero bytes, the commented part is not getting executed either. Ideas?

[Alexandre-io]

fileFilter must be at the same level as storage (https://github.com/expressjs/multer#multeropts) :

const upload = multer({
    storage: multerS3Storage,
    fileFilter: fileFilter
})