diff --git a/app/models/spotlight/resources/upload.rb b/app/models/spotlight/resources/upload.rb
index 6aaa0a5ae..59231109f 100644
--- a/app/models/spotlight/resources/upload.rb
+++ b/app/models/spotlight/resources/upload.rb
@@ -68,7 +68,7 @@ def sidecar_update_data
       end
 
       def custom_fields_data
-        data.slice(*exhibit.custom_fields.map(&:slug).map(&:to_s)).compact_blank
+        data.slice(*exhibit.custom_fields.map(&:field).map(&:to_s)).compact_blank
       end
 
       def configured_fields_data
diff --git a/spec/controllers/spotlight/resources/upload_controller_spec.rb b/spec/controllers/spotlight/resources/upload_controller_spec.rb
index a8a96e991..2687a957b 100644
--- a/spec/controllers/spotlight/resources/upload_controller_spec.rb
+++ b/spec/controllers/spotlight/resources/upload_controller_spec.rb
@@ -47,8 +47,8 @@
 
       it 'can add multivalued fields' do
         field = FactoryBot.create(:custom_field, exhibit: exhibit, is_multiple: true)
-        post :create, params: { exhibit_id: exhibit, resources_upload: { data: { field.slug => %w[1 2 3] } } }
-        expect(assigns[:resource].sidecar.data).to include(field.slug => %w[1 2 3])
+        post :create, params: { exhibit_id: exhibit, resources_upload: { data: { field.field => %w[1 2 3] } } }
+        expect(assigns[:resource].sidecar.data).to include(field.field => %w[1 2 3])
       end
     end
   end
diff --git a/spec/models/spotlight/resources/upload_spec.rb b/spec/models/spotlight/resources/upload_spec.rb
index 38af191dc..2ee5b72af 100644
--- a/spec/models/spotlight/resources/upload_spec.rb
+++ b/spec/models/spotlight/resources/upload_spec.rb
@@ -74,8 +74,8 @@
     end
 
     it 'the sidecar is updated with the appropriate data from custom fields' do
-      FactoryBot.create(:custom_field, exhibit: exhibit, slug: 'custom_field_1')
-      FactoryBot.create(:custom_field, exhibit: exhibit, slug: 'custom_field_2')
+      FactoryBot.create(:custom_field, exhibit: exhibit, field: 'custom_field_1')
+      FactoryBot.create(:custom_field, exhibit: exhibit, field: 'custom_field_2')
 
       expect(upload.sidecar).to receive(:update).with(
         data: hash_including('custom_field_1' => 'Custom Field 1 Data', 'custom_field_2' => 'Custom Field 2 Data')