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Browser Direct Uploads with Presigned URLs for SaaS Receipt Storage

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The article recommends private object storage with short-lived presigned URLs and multipart upload support for a media SaaS handling receipts. Under this approach, the application server authorizes transfers while the browser uploads bytes directly to storage, keeping files off the app server. Buckets should stay private, with separate short-lived URLs for uploads and downloads, and metadata such as keys, sizes, checksums, and receipt IDs stored in the database. The author flags that CORS configuration may not be self-service in every storage product and should be a launch checklist item. For large files, multipart uploads let a dropped connection cost only one part, and an application-level upload ID helps with recovery and tracing.

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