fix markdown

app.py

@@ -223,7 +223,20 @@ def create_and_run_app():
             # --- TAB 2: UPLOAD ---
             with gr.TabItem("Upload Data", id=1):
                 gr.Markdown("### Upload New Data to the Database")
-                gr.Markdown("You can upload multiple files of different types at once (text, images, audio), or drop a folder.")
+                gr.Markdown(
+                    """
+                    Upload your own data in a `.zip` file with the following folder structure:
+
+                    ```
+                    *.zip
+                    ├── images/
+                    ├── audios/
+                    └── texts/
+                    ```
+
+                    Each folder can be empty, but **must exist** for the app to work properly.
+                    """
+                    )
                 with gr.Column():
                     upload_file_input = gr.File(
                         label="Upload ZIP file containing your data",