Error empty files storage Supabase with NextJS

I am trying to do something very basic, just uploading images to my storage but they are empty

This is how I upload it to Supabase

async function uploadImage(file) {
  log(file)
  const fileExt = file[0].filename.split('.').pop();
  const fileName = `${Date.now()}.${fileExt}`;
  const { data, error } = await supabase
    .storage
    .from('images') // Nombre del bucket
    .upload(fileName, file[0]);

  if (error) {
    console.error('Error uploading image:', error);
    return null;
  }

  const { publicURL, error: urlError } = supabase
    .storage
    .from('images')
    .getPublicUrl(fileName);
  console.log(publicURL)
  console.log("###")
  if (urlError) {
    console.error('Error getting public URL:', urlError);
    return null;
  }

  return publicURL;
}

This is where I am executing this:

app.post('/api/posts', upload.fields([{ name: 'image', maxCount: 1 }, { name: 'video', maxCount: 1 }]), async (req, res) => {
    try {
      const { title, content } = req.body;
    //   log(req.image)
    //   log(req.content)
      let image = null;
      let video = null;
  
      if (req.files['image']) {
        // image = `/uploads/${req.files['image'][0].filename}`;
        const publicImageUrl = await uploadImage(req.files['image']);
        image = publicImageUrl; // Use the public URL
        log('Image URL obtained:', publicImageUrl);
        log(`Imagen subida: ${image}`);
      }

What am I doing wrong? Thank you