upload multiple files in one request Dropzone sending two requests

you can use uploadMultiple property default value false change it to true

$(".dropzone").dropzone({
            // autoQueue:false,
            parallelUploads:10,
            uploadMultiple:true,

https://www.dropzonejs.com/#config-uploadMultiple

The Issue was that I was using an input type="submit" which would do another post by itself, changing it to type button worked.

I was also seeing multiple POSTs with 2 files being sent at a time (so, for instance, 2 separate POSTs for 4 files total).

I found the solution here: increasing parallelUploads. I now create the dropzone in the following way:

var myDropzone = new Dropzone('div#dz', {
  url: 'http://httpbin.org/post',
  uploadMultiple: true,
  parallelUploads: 10
});

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