the problem i felt in work suite is when we add follow up to any lead in list we should be able to add time along with date and as accordingly to time there should be a push notification sent to devices which are being used. you can check google task mobile app for the same which sends reminders of task according to time and date accurately. your notifications can be done offline too if you are in development of android app it would be a great feature addition your software. i hope this will be done soon. thanks