Fix data structure and add backward compatibility

src/components/upload/UppyPhotoSubmissionUpload.tsx

@@ -202,10 +202,10 @@ export function UppyPhotoSubmissionUpload({
             title: photo.title?.trim(),
             order: index,
           })),
-          context: {
-            park_id: parkId,
-            ride_id: rideId,
-          },
+          // NEW STRUCTURE: context as string, IDs at top level
+          context: rideId ? 'ride' : parkId ? 'park' : undefined,
+          ride_id: rideId,
+          park_id: parkId,
         },
       };