diff --git a/backend/open_webui/retrieval/loaders/main.py b/backend/open_webui/retrieval/loaders/main.py
index 1346cd065c..969ced62e0 100644
--- a/backend/open_webui/retrieval/loaders/main.py
+++ b/backend/open_webui/retrieval/loaders/main.py
@@ -144,19 +144,17 @@ class DoclingLoader:
         with open(self.file_path, "rb") as f:
             headers = {}
             if self.api_key:
-                headers["Authorization"] = f"Bearer {self.api_key}"
-
-            files = {
-                "files": (
-                    self.file_path,
-                    f,
-                    self.mime_type or "application/octet-stream",
-                )
-            }
+                headers["X-Api-Key"] = f"Bearer {self.api_key}"
 
             r = requests.post(
                 f"{self.url}/v1/convert/file",
-                files=files,
+                files={
+                    "files": (
+                        self.file_path,
+                        f,
+                        self.mime_type or "application/octet-stream",
+                    )
+                },
                 data={
                     "image_export_mode": "placeholder",
                     **self.params,