changed callback to be async

example_file_drop.py

@@ -14,7 +14,7 @@ async def main_page():
     # Example 1: Multiple files with content
     uploaded_files = ui.column().classes('w-full mt-4')
 
-    def handle_multiple_files(file: FileData):
+    async def handle_multiple_files(file: FileData):
         with uploaded_files:
             with ui.card().classes('p-2 mb-2'):
                 ui.label(f"📄 {file['name']}").classes('font-medium')
@@ -26,7 +26,7 @@ async def main_page():
         on_upload=handle_multiple_files,
         multiple=True,
         accept='.pdf,.docx,.txt,.jpg,.png',
-        max_size=5  # 5MB limit
+        max_size=15  # 5MB limit
     ).classes('w-full max-w-xl mx-auto')
 
     ui.separator().classes('my-8')
@@ -72,7 +72,7 @@ async def main_page():
     # Example 4: Image drop with preview
     image_preview = ui.column().classes('w-full mt-4')
 
-    def handle_image(img: ImageData):
+    async def handle_image(img: ImageData):
         print(f"Image uploaded: {img['image'].format}, Size: {img['size']}")
         image_preview.clear()
         with image_preview: