CORS error (no permissions)

[sofibegino]

I am trying to upload photos through the react-dropzone-s3-uploader but I am not sure how to give access to the bucket. I get a CORS error and a 403 forbidden.

This is what I have so far

const handleFinishedUpload = (info) => {
    console.log("File uploaded with filename", info.filename);
    console.log("Access it on s3 at", info.fileUrl);
   
  };

const uploadOptions = {
    server: "http://localhost:3000",
    accept: 'image/*',
    autoUpload: true
    };
  const s3Url = "https://mybucket.s3.sa-east-1.amazonaws.com";
  
  <DropzoneS3Uploader
      onFinish={handleFinishedUpload}
      s3Url={s3Url}
      maxSize={5000*5000}
      upload={uploadOptions}
 />

Then in the server.js

import reactS3 from "react-dropzone-s3-uploader/s3router.js";

app.use('/s3', (reactS3)({
  bucket: 'mybucket',                      
  region: 'us-east-1',                         
  headers: {'Access-Control-Allow-Origin': '*'}, 
  ACL: 'private',                           
}));

And in the .env file I have the access and secret access keys.

I'd appreciate any help