show files attachments instead of file infos in API for acq.media release

app/serializers/serializable_acquired_media_release.rb

@@ -8,13 +8,13 @@ class SerializableAcquiredMediaRelease < JSONAPI::Serializable::Resource
               :applicable_medium_id, :applicable_medium_text, :territory_id, :territory_text, :term_id, :term_text,
               :restriction_id, :restriction_text, :categories, :description, :tag_list
   
-  has_many :file_infos do
+  has_many :files do
     data do
-      @object.file_infos
+      @object.files
     end
 
     meta do
-      { count: @object.file_infos.size }
+      { count: @object.files.size }
     end
   end
 end