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@@ -167,7 +167,7 @@ module Technoweenie # :nodoc:
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         base.after_save :after_process_attachment
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         base.after_destroy :destroy_file
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         base.after_validation :process_attachment
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-        base.attr_accessible 
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+        base.attr_accessible :uploaded_data
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         if defined?(::ActiveSupport::Callbacks)
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           base.define_callbacks :after_resize, :after_attachment_saved, :before_thumbnail_saved
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         end
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@@ -274,12 +274,12 @@ module Technoweenie # :nodoc:
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       def create_or_update_thumbnail(temp_file, file_name_suffix, *size)
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         thumbnailable? || raise(ThumbnailError.new("Can't create a thumbnail if the content type is not an image or there is no parent_id column"))
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         returning find_or_initialize_thumbnail(file_name_suffix) do |thumb|
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-          thumb.attributes = {
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+          thumb.temp_paths.unshift temp_file
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+          thumb.send(:'attributes=', {
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             :content_type             => content_type,
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             :filename                 => thumbnail_name_for(file_name_suffix),
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-            :temp_path                => temp_file,
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             :thumbnail_resize_options => size
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-          }
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+          }, false)
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           callback_with_args :before_thumbnail_saved, thumb
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           thumb.save!
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         end