Worked on the lancedb/lance repository to enable reliable handling of very large manifest files in cloud storage environments. Addressed the 5 GiB CopyObject limitation by implementing a size-aware copy mechanism that conditionally uses a multipart read-and-rewrite path for large manifests, while preserving efficient server-side copies for smaller files. Tightened the maximum upload part size to avoid edge cases with exact 5 GiB uploads, ensuring robust operation during shutdown scenarios. Developed comprehensive tests and documentation to support maintainability. The work leveraged Rust, asynchronous programming, and cloud storage integration, delivering scalable backend solutions for both S3 and GCS storage providers.