Audio Upload: File smaller than cap but rejected because too large

[Ben Stutsky]

I finally got things working enough to oauth and queue posts in ruby. However, when uploading a 5MB audio file I keep getting a file too large error... The audio file cap is 10MB so I am not sure why this is happeneing. Below is my code:

require "uri"
require 'net/http'
require "oauth"
require 'open-uri'

#
#Secrets Omitted
#

@consumer = OAuth::Consumer.new(
        CONSUMER_KEY,
        SECRET_KEY,
        { :site => 'http://www.tumblr.com',
          :request_token_path => '/oauth/request_token',
          :authorize_path => '/oauth/authorize',
          :access_token_path => '/oauth/access_token',
          :http_method => :get
        }
      )
@access_token = OAuth::AccessToken.new(@consumer, USER_CONSUMER_KEY, USER_SECRET_KEY)
@res = @access_token.post("http://api.tumblr.com/v2/blog/XXXXXXXXX.tumblr.com/post",
    {
    :type => 'audio',
    :state => 'queue',
    :data => URI::encode(File.binread("XXXXXXXXXX/file.mp3"))
    })