[Rails] submit form with file upload + cross domain

I am trying to submit a form in rails 4 with File upload(using paperclip) to an another domain using Ajax with dataType 'jsonp' ( I tried both ajax and ajaxForm ).

// .js

$(".form").ajaxSubmit({

      type: $(".form").attr("method"),

      dataType: "jsonp",

      url: $(".form").attr("action"),

      data: $(".form").serialize(),

      success: function(data) {

        console.log('respone');

        console.log(data);

      }

    }); 

I am getting the following error message.

Can't verify CSRF token authenticity

Completed 422 Unprocessable Entity in 26ms

ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken):

I can save data when i am not attach any file. 

I got one solution, 

skip_before_filter :verify_authenticity_token  

I can save data by skipping verify authentication token. But I think this is not a secure way.

Can any one know a secure way? any suggestion please!

Note: I am getting all the params values in the destination domain.

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