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You can handle the storage exception and display a custom error message when a particular file is absent in the Firebase Storage.

Here's an example of how you can achieve this:

1. Import the necessary packages:

import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/services.dart';

1. Wrap your code that uploads/downloads the file in a try-catch block:

try {
  // your code to upload/download the file
} on PlatformException catch (e) {
  // handle the storage exception
  if (e.code == 'storage/object-not-found') {
    // show custom error message when file is absent
    print('File not found');
  } else {
    // handle other storage exceptions
    print('Error: ${e.message}');
  }
} catch (e) {
  // handle other exceptions
  print('Error: $e');
}

In the above code, we're catching the PlatformException thrown by Firebase Storage. If the exception code is storage/object-not-found, we can assume that the file is absent, and we can display a custom error message. For other storage exceptions, we can print the error message.

1. You can also use this logic to show a different UI or navigate to a different screen when the file is absent.

if (e.code == 'storage/object-not-found') {
  // show custom error message when file is absent
  Navigator.of(context).push(
    MaterialPageRoute(
      builder: (context) => FileNotFoundErrorScreen(),
    ),
  );
}

In the above code, we're navigating to a different screen when the file is absent, instead of showing a custom error message. You can customize this logic as per your requirement.

I hope this helps! Let me know if you have any further questions.