diff --git a/app/models/embed/purl/resource.rb b/app/models/embed/purl/resource.rb
index b8909b2ac..e385744b1 100644
--- a/app/models/embed/purl/resource.rb
+++ b/app/models/embed/purl/resource.rb
@@ -47,7 +47,11 @@ def size
 
       # @return [ResourceFile]
       def primary_file
-        files.find(&:primary?)
+        files.find { |file| primary_types.include?(file.mimetype) }
+      end
+
+      def primary_types
+        @primary_types ||= Array(Settings.primary_mimetypes[type])
       end
 
       # @return [ResourceFile]