Hey everyone, Struggling to workout when i add the following validtion to my Voice model using paperclip, it is being triggered when i try and upload an mp3: class Voice < ActiveRecord::Base has_attached_file :clip validates_attachment_presence :clip validates_attachment_content_type :clip, :content_type => [ 'application/mp3', 'application/x-mp3', 'audio/mpeg', 'audio/mp3' ], :message => 'file must be of filetype .mp3' validates_attachment_size :clip, :less_than => 10.megabytes validates_presence_of :title end I have tried a number of different mp3 files but none of them seem to upload because the validation is failing.