Use account-level endpoint

src/app/api/upload/route.ts

@@ -9,6 +9,9 @@ function getR2() {
     const secretKey = "244fcc44041f452241cbc68374cd7a6ca651cb71f361bc36cc932407bbe37863";
     const bucket = "tia";
 
+    // Try just account-level endpoint (no bucket in path)
+    const endpoint = `https://${accountId}.r2.cloudflarestorage.com`;
+
     if (!accountId || !accessKeyId || !secretKey || !bucket) {
       throw new Error(`Missing R2 config`);
     }