diff --git a/app.py b/app.py
index a254e98..74b0df7 100644
--- a/app.py
+++ b/app.py
@@ -78,11 +78,23 @@ def upload():
             os.path.join(CWD, "metadatum", metadata_name)
         )
 
+        fields = ["title", "author", "comments", "timestamp", "tags"]
+        side_a = [
+            field
+            for field in upload_form.data.keys()
+            if field in fields and upload_form.data[field] == "side a"
+        ]
+        side_b = [
+            field
+            for field in upload_form.data.keys()
+            if field in fields and upload_form.data[field] == "side b"
+        ]
+
         make_cards(
             pdf_path,
             metadata_conn,
-            ["title", "timestamp", "comments", "authors"],
-            ["tags"],
+            side_a,
+            side_b,
         )
 
         gen_msg = (