**Fixes #24: Handle FileChooser Cancellation in Video Upload App**

video_upload_app.py

@@ -0,0 +1,107 @@
+from kivy.app import App
+from kivy.lang import Builder
+from kivymd.app import MDApp
+from plyer import filechooser
+import re
+import pyrebase
+
+kv = '''
+<MainScreen>:
+    name: 'mainscreen'
+    MDLabel:
+        id: username_info
+        text: 'Hello Main'
+        font_style: 'H1'
+        halign: 'center'
+
+    MDFloatLayout:
+        id: floate
+        Video:
+            id: vid
+
+        MDToolbar:
+            title: 'Bottom navigation'
+            md_bg_color: .2, .2, .2, 1
+            specific_text_color: 1, 1, 1, 1
+
+        MDBottomNavigation:
+            panel_color: 1, 1, 1, 1
+            MDBottomNavigationItem:
+                name: 'screen 1'
+                text: 'Home'
+                icon: 'home-outline'
+                MDRaisedButton:
+                    id: upload
+                    text: 'Upload'
+                    pos_hint: {'center_x': .5, 'center_y': .4}
+                    on_release:
+                        app.file_chooser()
+'''
+
+class VideoUploadApp(MDApp):
+    def build(self):
+        self.strng = Builder.load_string(kv)
+        self.url = "link.json"  # Replace with your Firebase config
+        return self.strng
+
+    def file_chooser(self):
+        try:
+            # Support both Android and desktop platforms
+            if platform == 'android':
+                from android.permissions import request_permissions, Permission
+                request_permissions([Permission.READ_EXTERNAL_STORAGE])
+
+            filechooser.open_file(
+                on_selection=self.selected,
+                filters=['*.mp4', '*.avi', '*.mkv']  # Filter for video files
+            )
+        except Exception as e:
+            print(f"Error opening file chooser: {e}")
+
+    def selected(self, selection):
+        try:
+            # Handle case when user cancels file selection
+            if not selection:
+                print("File selection cancelled")
+                return
+
+            config = {
+                # Add your Firebase config here
+                'apiKey': 'your-api-key',
+                'authDomain': 'your-auth-domain',
+                'projectId': 'your-project-id',
+                'storageBucket': 'your-storage-bucket',
+                'messagingSenderId': 'your-messaging-sender-id',
+                'appId': 'your-app-id'
+            }
+
+            firebase = pyrebase.initialize_app(config)
+            storage = firebase.storage()
+
+            file_path = selection[0]
+            file_name = re.findall(r'[^/\\]+$', file_path)[0]  # Extract filename safely
+
+            # Get login email from the login screen
+            try:
+                login_email = self.strng.get_screen('loginscreen').ids.login_email.text
+            except:
+                login_email = "default_user"  # Fallback if login screen not available
+
+            # Upload file to Firebase
+            storage.child(f"{login_email}/{file_name}").put(file_path)
+
+            # Update UI
+            self.root.ids.vid.source = file_path
+            self.root.ids.upload.disabled = True
+
+            # Optional: Switch to upload screen if it exists
+            if 'uploadscreen' in self.strng.screen_manager.screen_names:
+                self.strng.get_screen('mainscreen').manager.current = 'uploadscreen'
+                self.strng.get_screen('mainscreen').manager.transition.direction = 'left'
+
+        except Exception as e:
+            print(f"Error during file upload: {e}")
+            self.root.ids.upload.disabled = False
+
+if __name__ == '__main__':
+    VideoUploadApp().run()