diff --git a/lib/object-storage-web/src/use-upload.ts b/lib/object-storage-web/src/use-upload.ts
index 7808fa66..83e5135c 100644
--- a/lib/object-storage-web/src/use-upload.ts
+++ b/lib/object-storage-web/src/use-upload.ts
@@ -179,7 +179,15 @@ export function useUpload(options: UseUploadOptions = {}) {
       });
 
       if (!response.ok) {
-        throw new Error("Failed to get upload URL");
+        const errorData = await response.json().catch(() => ({}));
+        const serverMsg =
+          (typeof errorData?.error === "string" && errorData.error) ||
+          (typeof errorData?.message === "string" && errorData.message) ||
+          "";
+        const detail = serverMsg
+          ? `${serverMsg} (HTTP ${response.status})`
+          : `HTTP ${response.status} ${response.statusText || ""}`.trim();
+        throw new Error(`Failed to get upload URL: ${detail}`);
       }
 
       const data = await response.json();