Update app.py

app.py

@@ -34,9 +34,16 @@ app.layout = dbc.Container([
                 },
                 multiple=False
             ),
+            dbc.Alert(id="upload-status", is_open=False, duration=4000, className="mt-3"),
             dbc.Input(id="url-input", placeholder="Or enter PDF URL", type="text", className="mt-3"),
             dbc.Button("Compress PDF", id="compress-btn", color="primary", className="mt-3"),
-            dbc.Spinner(html.Div(id="compression-status"), color="primary", type="grow", spinner_class_name="mt-3"),
+            dbc.Spinner(
+                html.Div(id="compression-status", className="mt-3"),
+                color="primary",
+                type="border",
+                fullscreen=True,
+                fullscreen_style={"backgroundColor": "rgba(0, 0, 0, 0.3)"},
+            ),
             dcc.Download(id="download-pdf"),
         ])
     ]),
@@ -82,6 +89,18 @@ def compress_pdf(input_file, url):
     except Exception as e:
         return None, f"Error compressing PDF: {str(e)}"
 
+@callback(
+    Output("upload-status", "children"),
+    Output("upload-status", "is_open"),
+    Output("upload-status", "color"),
+    Input("upload-pdf", "filename"),
+    Input("upload-pdf", "contents"),
+)
+def update_upload_status(filename, contents):
+    if filename is not None and contents is not None:
+        return f"File uploaded: {filename}", True, "success"
+    return "", False, "primary"
+
 @callback(
     Output("compression-status", "children"),
     Output("download-pdf", "data"),