Update app.py

app.py

@@ -40,20 +40,19 @@ def process_upload(files):
     """
     Accepts a list of uploaded file paths, saves them to a local folder,
     loads them as documents, and builds the vector index and chat engine.
+    This version accumulates files, so if you upload more files later,
+    they are added to the existing document set.
     """
     upload_dir = "uploaded_files"
     if not os.path.exists(upload_dir):
         os.makedirs(upload_dir)
-    else:
-        # Clear any existing files in the folder.
-        for f in os.listdir(upload_dir):
-            os.remove(os.path.join(upload_dir, f))
     
-    # 'files' is a list of file paths (Gradio's File component with type="file")
+    # Copy new files into the folder without clearing existing ones.
     for file_path in files:
         file_name = os.path.basename(file_path)
         dest = os.path.join(upload_dir, file_name)
-        shutil.copy(file_path, dest)
+        if not os.path.exists(dest):
+            shutil.copy(file_path, dest)
     
     # Load documents from the saved folder.
     documents = SimpleDirectoryReader(upload_dir).load_data()
@@ -135,7 +134,7 @@ def gradio_interface():
                 label="Upload Files",
                 file_count="multiple",
                 file_types=[".pdf", ".csv", ".txt", ".xlsx", ".xls", ".doc", ".docx"],
-                type="filepath"  
+                type="filepath"
             )
             upload_status = gr.Textbox(label="Upload Status", interactive=False)
             upload_button = gr.Button("Process Upload")