add-s3-handler

Presigned URLs for S3 uploads with tenant isolation are generated by a centralized service that scopes S3 key prefixes per tenant, ensuring secure direct client uploads while capturing file metadata like content type and size for retrieval and auditing.

Presigned URLs are the best way to avoid Lambda proxying for large S3 downloads, allowing clients to download files directly from S3, which significantly reduces latency and compute overhead compared to proxying through application code.

S3 key prefix isolation for multi-tenant file management works by assigning unique path prefixes to each tenant within a bucket, ensuring data segregation and access validation to prevent one tenant from accessing another tenant's files or metadata.

Yes, you can use presigned URLs to manage file metadata across multiple tenants by pairing them with a centralized service that captures file name, content type, size, and original ownership to ensure tenant isolation and auditability.

A centralized service is needed for tenant-scoped S3 file operations to handle access validation by tenant, generate presigned URLs, manage file metadata, and execute common workflows like listing tenant files and cleaning up attachments securely.

A limitation of using presigned URLs for multi-tenant S3 storage is that direct client transfers bypass application logic, requiring a separate centralized service to validate tenant access, preserve file metadata, and audit upload or download events.