Worked on the outline/outline repository to enhance cross-backend storage compatibility by implementing conditional ACL handling in the S3Storage layer. Using TypeScript and backend development skills, addressed integration challenges between AWS S3 and Google Cloud Storage by supporting Uniform Bucket-Level Access, which disables object-level ACLs. The solution involved updating the store and getPresignedPost methods to skip object-level ACLs when UBBL is enabled, preventing InvalidArgument errors and reducing runtime issues in multi-cloud environments. This approach maintained backward compatibility for non-GCS backends, streamlined user configuration, and improved reliability for cloud storage integration without introducing breaking changes or regressions.