Uploading files with Dropzone

I’ve added dropzone in my project and added following code:

if (Meteor.isServer) {
  Meteor.startup(function () {
      tmpDir: process.env.PWD + '/public/uploads',
      uploadDir: process.env.PWD + '/public/uploads',
      checkCreateDirectories: true,
      uploadUrl: '/upload'

In template:

<form id="add-project">
    <div class="form-group">
        <label for="title">Project Title</label>
        <input type="text" class="form-control required" id="title" name="projectTitle" placeholder="Project Title">
    <div class="form-group">
        <label for="upload">Upload Files</label>                                    
        {{>dropzone url="/upload" id="template-helper"}}
    <div class="form-group">                                                                
        <button type="submit" class="btn btn-primary btn-block">Submit</button>

How can i submit dropzone data into my collection when the form is submitted and how to retrieve them?
Is there any customization(Cropping Image, generate different size thumbnails) options available for dropzone?