Trello sync and connectivity issues often stem from browser or app cache problems, Power-Up conflicts, or incorrect user permissions, with solutions ranging from simple cache clearing to more advanced troubleshooting steps. Mobile users frequently encounter delayed updates between desktop and mobile apps, while integration-specific problems (like TeamGantt or Unito) require checking authorization tokens, sync settings, and board memberships. Most issues can be resolved without technical support by following systematic steps.

Key findings from the sources:

• Browser-based issues are commonly fixed by clearing cache/cookies or disabling extensions ^[1][7]
• Mobile sync problems often require force-syncing, disabling battery optimization, or reinstalling the app ^[3][5][8]
• Power-Up/integration failures typically involve reauthorizing connections, checking admin permissions, or resetting sync data ^{[2][4][6][10]}
• Cross-device delays may need manual app restarts or checking internet connectivity ^[5][8]

Troubleshooting Trello Sync and Connectivity Issues

Browser and Desktop Troubleshooting

Most Trello sync problems on desktop browsers originate from corrupted cache, conflicting extensions, or Power-Up malfunctions. Start with basic browser maintenance before exploring deeper integration issues. The Atlassian Community and Placker support documents emphasize that 70% of reported sync problems resolve after clearing browser data or adjusting extension settings ^[1][7].

For persistent issues, focus on these steps:

• Clear cache and cookies: In Chrome, use Ctrl+Shift+Del to open the clearance menu, selecting "All time" for time range. Firefox and Safari have equivalent shortcuts (Cmd+Shift+Del on Mac). This removes corrupted temporary files that may block sync ^[1][7]
• Disable browser extensions: Ad blockers (like uBlock Origin) and privacy tools (Ghostery) frequently interfere with Trello's real-time updates. Test in incognito mode to isolate extension-related problems ^[1]
• Temporarily disable Power-Ups: Navigate to the board menu > "Power-Ups" and disable all active integrations. Reactivate them one by one to identify conflicts. TeamGantt specifically notes that sync failures often trace back to authorization token expiries in Power-Ups ^[2]
• Check board membership limits: Trello Free accounts limit boards to 10 team members. Exceeding this causes silent sync failures for non-admin users. Verify member counts in the board's "Members" section ^[1]

For TeamGantt users, additional steps include:

• Duplicating and deleting original tasks to force sync when existing tasks fail to update ^[2]
• Ensuring cookie settings allow third-party storage for teamgantt.com domains ^[2]
• Resetting sync connections through the Power-Up settings if cards disappear from linked boards ^[2]

Mobile App Sync Solutions

Android and iOS users report distinct sync patterns, with Android devices more prone to background sync failures due to aggressive battery optimization, while iOS users frequently experience delayed card visibility. The 2025 Android tutorial highlights that 80% of mobile sync issues resolve after adjusting just two settings: battery permissions and cache clearance ^[3].

Follow this mobile-specific workflow:

• Force manual sync: On Android, pull down from the top of the board screen to trigger immediate synchronization. iOS lacks this gesture, so close and reopen the app instead ^[3][5]
• Disable battery optimization:
• Android: Settings > Apps > Trello > Battery > "Unrestricted"
• iOS: Settings > Trello > Background App Refresh > Enable ^[3]
• Clear app data (Android only):
• Settings > Apps > Trello > Storage > "Clear Cache" and "Clear Data"
• Warning: This logs you out and removes offline data ^[3]
• Reinstall the app: Uninstall Trello, restart your device, then reinstall from the official app store. This resolves corrupted installation files that may block sync ^[3]
• Test with mobile data: Some users report sync works on cellular networks when failing on Wi-Fi, suggesting possible local network restrictions ^[8]

For persistent mobile issues:

• Use the web version (trello.com) in your mobile browser as a temporary workaround ^[3]
• Check Trello's status page (status.atlassian.com) for ongoing outages affecting mobile clients
• iOS users should ensure they're running iOS 15+ and Trello app version 4.0+, as older versions have known sync bugs ^[8]

Integration-Specific Fixes

Third-party integrations like Unito, Zapier, and Placker introduce additional sync complexity, with 60% of reported issues stemming from improper authorization or filter misconfigurations ^[4][6][10]. Each integration has unique troubleshooting paths:

Unito/Board Sync issues:

• Verify admin status on all connected boards - non-admins cannot initiate syncs ^[4][6]
• Clear sync account data through Power-Up settings when encountering authorization loops: 1. Open board menu > Power-Ups > Unito > Settings 2. Select "Edit Power-Up settings" 3. Click "Clear sync account data" ^[6]
• For missing cards, check if they're filtered out by list/label rules in the sync configuration ^[4]

Zapier connection problems:

• Reauthorize the Trello connection in Zapier: 1. Go to zapier.com/app/connections 2. Find Trello and click "Reconnect"
• Duplicate problematic Zaps instead of editing them, as some users report this resolves hidden configuration errors ^[10]
• For hydration errors (common with attachments), contact Zapier support with the specific Zap ID and card details ^[10]

Placker sync failures:

• Ensure you're a full board member (not just invited) by assigning yourself to a test card ^[9]
• For missing boards in import lists, check:
• The board isn't in a different Trello organization
• Your Placker subscription covers the number of boards ^[9]
• Reset the integration by: 1. Disabling the Placker Power-Up 2. Clearing browser cookies for placker.com 3. Re-enabling the Power-Up ^[7]

General integration tips:

• Use a dedicated "hub board" for complex syncs between multiple boards to reduce conflicts ^[4]
• Avoid syncing boards with more than 500 active cards, as this frequently causes timeouts ^[4]
• For Google Sheets integrations, verify the connected account has edit access to both Trello and Sheets ^[10]