If the mobile app shows an amber sync badge for more than a few minutes after you're back online:
Try in order
Pull to refresh any list view. This forces an immediate sync.
Sign out and back in. The app re-establishes its sync session from scratch.
Update the app. Check the App Store / Play Store — older builds occasionally have stuck-sync bugs that newer ones fix.
Check the pending list by tapping the sync badge. If you see a specific item failing, screenshot it and contact support.
Critical: don't reinstall while items are queued
Reinstalling the app deletes locally queued items that haven't synced yet. If your sync badge is amber, sign in and let it finish before reinstalling.