Version 2.3 notify on invalid tasks/vCard objects (events will follow) add app setting for notification channels: Notification settings (only Android 8+) use default time-zone to store floating DATE-TIMEs exceptions of recurring events: use main event’s DTSTART time zone for RECURRENCE-ID library updates minor improvements and bug fixes When you tap a notification about invalid iCalendar/vCard objects, you can see more information, including the URL of the invalid object. You can hide all “Sync warnings” in the app notification settings (Android 8+ only, because this depends on notification channels), but we recommend to care about these messages, because it means that some events/tasks could not be synchronized.