During January 2026, Link Zhu enhanced S3 presigned URL generation in the qor5/x repository, focusing on backend development and AWS S3 integration using Go. He refactored the GetURL function to access the S3Endpoint directly from configuration, removing redundant runtime checks and simplifying endpoint resolution. Additionally, he introduced Content-Disposition headers to presigned URLs, ensuring that downloaded files have stable, user-friendly filenames. These changes reduced operational overhead and improved the reliability of download links by centralizing configuration and clarifying code paths. The work demonstrated a targeted approach to maintainability and performance, addressing a specific feature need with clear, traceable improvements.