diff --git a/src/app/api/upload/route.ts b/src/app/api/upload/route.ts
index 30c2439..b1d6c4d 100644
--- a/src/app/api/upload/route.ts
+++ b/src/app/api/upload/route.ts
@@ -12,11 +12,8 @@ function getR2() {
     throw new Error(`Missing R2 config`);
   }
 
-  // Bucket is at subdomain: tia.<accountId>.r2.cloudflarestorage.com
-  // Or path: <accountId>.r2.cloudflarestorage.com/tia
-  const endpoint = bucket === "tia"
-    ? `https://${bucket}.${accountId}.r2.cloudflarestorage.com`
-    : `https://${accountId}.r2.cloudflarestorage.com/${bucket}`;
+  // Use public development URL (from R2 bucket settings)
+  const pubBaseUrl = `https://pub-${accountId}.r2.dev/${bucket}`;
 
   return {
     client: new S3Client({
@@ -25,7 +22,7 @@ function getR2() {
       credentials: { accessKeyId, secretAccessKey: secretKey },
     }),
     bucket,
-    baseUrl: `https://${accountId}.r2.cloudflarestorage.com/${bucket}`,
+    baseUrl: pubBaseUrl,
   };
 }