Issue Description
App data (email, cloud files, messages) does not sync automatically.
Common Causes
Background data restricted
Sync disabled at account level
Battery optimization blocking sync
Step-by-Step Solution
Step 1: Enable Background Data
Settings → Apps → App Name → Mobile data
Enable Background data
Step 2: Check Account Sync
Settings → Accounts
Select account → Enable required sync options
Step 3: Disable Battery Optimization
Settings → Apps → App Name → Battery
Set to Unrestricted
Step 4: Restart Phone
Forces sync services refresh
Explore Further
Remove and re-add account
Prevention & Best Practices
Avoid aggressive battery saver modes.