collections.coffee

#
# FS Collection
#
profileThumbsStore = new FS.Store.S3('thumb',
  accessKeyId     : 'XXXXXXXXXXXXXXXXXX'
  secretAccessKey : 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  bucket          : 'my-bucket-name'
  folder          : 'thumb'
  transformWrite  : (fileObj, readStream, writeStream) ->
    gm(readStream, fileObj.name()).resize("100", "100").stream().pipe writeStream
    return
)

profileStore = new FS.Store.S3('original',
  accessKeyId     : 'XXXXXXXXXXXXXXXXXX'
  secretAccessKey : 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  bucket          : 'my-bucket-name'
  folder          : 'original'
)

@Images = new FS.Collection('profiles',
  stores: [profileStore, profileThumbsStore]
)

my_template.coffee

#
# Template Events
#
Template.my_template.events

  'change .profile-image': (event, template) ->
    files = event.target.files
    i = 0
    ln = files.length

    while i < ln
      Images.insert files[i], (err, fileObj) ->
        console.log fileObj
      i++
    return

my_template.html

<template name="my_template">
  <input type="file" class="profile-image">
</template>