The constraint that changes this decision is not file size; it is which system must absorb every uploaded byte during a traffic spike. Short answer: use a short-lived signed URL for direct browser uploads of ordinary private documents, while keeping authorization and metadata creation on the app...

Source: [Dev.to](https://dev.to/rasmusberg6592/presigned-file-upload-for-saas-url-delivery-or-relaying-through-the-server-ik5)

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