If you encounter any problems or have any suggestions, you can enter Settings > “Questions and Feedback” in the App and click “Questions” or “Suggestion and Feedback”. You may be prompted to turn on the notification permission. After selecting “Yes” ,you will be navigated to system notification setting, select Allow notification to receive reply notifications in time.

You can also send an email to handy-app-help@outlook.com (please provide the iOS or MacOS version and the APP name and version displayed on the Settings > About page in the App)