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I notice that the URL you've shared appears suspicious and is not related to official AWS documentation or support. I strongly advise against clicking on or sharing such links as they may pose security risks.
Regarding your synchronization issue between Cognito and S3 for your Stardew Valley mobile app, here are some recommendations:
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Token Management: Implement proper token refresh logic in your application. When a token is about to expire, proactively refresh it before attempting any S3 operations.
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Error Handling: Add robust error handling for authentication failures, including automatic retry mechanisms with exponential backoff when S3 operations fail due to authentication issues.
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Session Validation: Before attempting to sync game progress, verify that the user's session is valid and active.
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Offline Mode: Implement a local caching mechanism that stores game progress locally when connectivity issues occur, then syncs when connectivity is restored.
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Multipart Uploads: For larger save files, consider using S3's multipart upload functionality, which can be more resilient to intermittent connectivity issues.
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Transfer Acceleration: If your users are geographically distributed, enabling S3 Transfer Acceleration might help improve the reliability and speed of uploads, especially for larger save files.
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Monitoring: Implement detailed logging and monitoring to better understand when and why synchronization failures occur.
For a more stable approach, you might consider implementing a server-side component that handles the authentication and S3 operations, rather than doing this directly from the mobile client.
I recommend reviewing AWS best practices for mobile applications using Cognito and S3 to ensure your implementation follows recommended patterns.
Sources
Learn the basics of Amazon S3 with an AWS SDK - AWS SDK Code Examples
S3 Transfer Acceleration
