I just wanted to add to this... I know I am 5 years too late, but I 
didn't want anyone else to be led astray.

You should be able to pull anything you can download in your browser 
into your app using tempfile. I had to play with it for a while, but 
something like this worked:

 require "open-uri"
 url = "whatev.com/file_id"
 file_name = "local_filename.pdf"

 Tempfile.new(file_name).tap do |file|
     file.binmode
     file.write(open(url).read)
     file.close
 end

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