Access to XMLHttpRequest at 'https://httpbin.org/post' from origin 'https://react-dropzone-uploader.js.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

[Ravi-Seffcon]

I integrated the react-dropzone-uploader in my project and on the staging instance, during some testing, realized that not all files get uploaded seamlessly.

I then check the demo at https://react-dropzone-uploader.js.org/docs/quick-start and reproduced the same issue.
Many times, not all files dropped get uploaded. It gives the error as:

Access to XMLHttpRequest at 'https://httpbin.org/post' from origin 'https://react-dropzone-uploader.js.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. VM33:20 exception_upload {name: 'nature1.jpg', size: 6800, type: 'image/jpeg', lastModifiedDate: '2016-06-20T19:09:22.000Z', uploadedDate: '2023-05-25T10:29:54.249Z', …} File {name: 'nature1.jpg', lastModified: 1466449762000, lastModifiedDate: Tue Jun 21 2016 00:39:22 GMT+0530 (India Standard Time), webkitRelativePath: '', size: 6800, …} bundle.4e191a10.js:12 POST https://httpbin.org/post net::ERR_FAILED 504 _calle

Can you someone please advise?