title: Meteor Amazon S3 image upload with thumbnails
body: <p>I'm using <a href="https://www.meteor.com/">Meteor</a> and would like to create a form with an image upload field that saves the uploaded file to an Amazon S3 bucket in its original size as well as multiple thumbnails sizes defined (passed) via the code.</p>
  
  <p>So far I'm using the <a href="https://atmospherejs.com/lepozepo/s3">lepozepo:s3 package</a> which works great but doesn't seem to allow options for generating additional thumbnails.</p>
  
  <p>Given I can upload the original files onto S3 I'm considering looking into a service on Amazon that can generate the desired thumbnails and then notify my Meteor app. But I'm not sure how to achieve that.</p>
  
  <p>Can anyone point me in the right direction or share some insight into the best approach for this?</p>
  
  <p>PS: I want to avoid using Filepicker.io is possible.</p>