diff --git a/api/extensions/storage/local_fs_storage.py b/api/extensions/storage/local_fs_storage.py
index e458b3ce8a..b4146d7384 100644
--- a/api/extensions/storage/local_fs_storage.py
+++ b/api/extensions/storage/local_fs_storage.py
@@ -19,68 +19,48 @@ class LocalFsStorage(BaseStorage):
             folder = os.path.join(current_app.root_path, folder)
         self.folder = folder
 
-    def save(self, filename, data):
+    def _build_filepath(self, filename: str) -> str:
+        """Build the full file path based on the folder and filename."""
         if not self.folder or self.folder.endswith("/"):
-            filename = self.folder + filename
+            return self.folder + filename
         else:
-            filename = self.folder + "/" + filename
+            return self.folder + "/" + filename
 
-        folder = os.path.dirname(filename)
+    def save(self, filename, data):
+        filepath = self._build_filepath(filename)
+        folder = os.path.dirname(filepath)
         os.makedirs(folder, exist_ok=True)
-
-        Path(os.path.join(os.getcwd(), filename)).write_bytes(data)
+        Path(os.path.join(os.getcwd(), filepath)).write_bytes(data)
 
     def load_once(self, filename: str) -> bytes:
-        if not self.folder or self.folder.endswith("/"):
-            filename = self.folder + filename
-        else:
-            filename = self.folder + "/" + filename
-
-        if not os.path.exists(filename):
+        filepath = self._build_filepath(filename)
+        if not os.path.exists(filepath):
             raise FileNotFoundError("File not found")
-
-        data = Path(filename).read_bytes()
-        return data
+        return Path(filepath).read_bytes()
 
     def load_stream(self, filename: str) -> Generator:
-        def generate(filename: str = filename) -> Generator:
-            if not self.folder or self.folder.endswith("/"):
-                filename = self.folder + filename
-            else:
-                filename = self.folder + "/" + filename
+        filepath = self._build_filepath(filename)
 
-            if not os.path.exists(filename):
+        def generate() -> Generator:
+            if not os.path.exists(filepath):
                 raise FileNotFoundError("File not found")
-
-            with open(filename, "rb") as f:
+            with open(filepath, "rb") as f:
                 while chunk := f.read(4096):  # Read in chunks of 4KB
                     yield chunk
 
         return generate()
 
     def download(self, filename, target_filepath):
-        if not self.folder or self.folder.endswith("/"):
-            filename = self.folder + filename
-        else:
-            filename = self.folder + "/" + filename
-
-        if not os.path.exists(filename):
+        filepath = self._build_filepath(filename)
+        if not os.path.exists(filepath):
             raise FileNotFoundError("File not found")
-
-        shutil.copyfile(filename, target_filepath)
+        shutil.copyfile(filepath, target_filepath)
 
     def exists(self, filename):
-        if not self.folder or self.folder.endswith("/"):
-            filename = self.folder + filename
-        else:
-            filename = self.folder + "/" + filename
-
-        return os.path.exists(filename)
+        filepath = self._build_filepath(filename)
+        return os.path.exists(filepath)
 
     def delete(self, filename):
-        if not self.folder or self.folder.endswith("/"):
-            filename = self.folder + filename
-        else:
-            filename = self.folder + "/" + filename
-        if os.path.exists(filename):
-            os.remove(filename)
+        filepath = self._build_filepath(filename)
+        if os.path.exists(filepath):
+            os.remove(filepath)