fix

app.py

@@ -150,7 +150,7 @@ def upload_files():
                     if file_extension in [".jpeg", ".jpg", ".png"]:
                         loader_kwargs['mode'] = 'single'
                     elif file_extension == ".pdf":
-                        loader_kwargs['strategy'] = 'fast'
+                        loader_kwargs['strategy'] = 'hi_res'
                         loader_kwargs['languages'] = ['eng']
 
                     print(f"Loading {filename} with {loader_class.__name__}...")