Enable Google Sync On Gmail Account -

If your Google Drive is 100% full, syncing often stops.

Start a draft on your desktop and finish it on the bus. How to Enable Sync (The 2-Minute Version) On Android Enable Google Sync On Gmail Account

Ensure "Auto-sync data" isn't turned off in your phone's battery-saver mode. If your Google Drive is 100% full, syncing often stops

If your digital life feels like it’s living in two different worlds, it’s time to flip the switch on . Here’s the quick and dirty on how to get your Gmail, Calendar, and Contacts talking to each other across all your devices. Why Bother Syncing? and it’s marked as read everywhere.

Read an email on your tablet, and it’s marked as read everywhere.