Issue Description
App data (mail, cloud files, messages) fails to sync properly.
Common Causes
Background refresh disabled
iCloud or account sync disabled
Network interruptions
Step-by-Step Solution
Step 1: Enable Background App Refresh
Settings → General → Background App Refresh
Set to Wi-Fi & Cellular Data
Step 2: Check App Sync Settings
Enable sync within app and account settings
Step 3: Disable Low Power Mode
Allows background sync
Step 4: Restart iPhone
Refreshes sync services
Explore Further
Remove and re-add account if sync fails
Prevention & Best Practices
Avoid aggressive battery saver settings.