Upstash Sync Connection Success but No Data Transfer (iOS & Web)

[skiingbeast2025]

I am currently experiencing a sync issue with NextChat version 2.16.1 running on both iOS (via PWA) and browser. I have configured Upstash Redis for synchronization, and the "Check Connection" button returns a success status on both programs. However, despite the successful connection check, clicking the Sync button does not actually transfer any chat data between my devices. I have already verified that the Access Code is identical on both the PWA and browser, and I have confirmed that the Upstash Endpoint and Access Key are correct. I have also attempted troubleshooting steps such as toggling the CORS proxy setting on and off but the issue persists where the sync appears to connect but sends no data. I would appreciate any insights into why the sync connects successfully but fails to transfer the conversation history.