The answer
No. It can be reused while valid, including to replace content at the authorized key. Design short expiration and finalization controls with that behavior in mind.
What are presigned upload URLs?
Is an R2 presigned upload URL automatically invalid after its first use?
More FAQs in What are presigned upload URLs?
No. The backend should allocate or validate the key within an authorized upload record, binding it to the requesting user and wedding before granting upload permission.
No. R2 presigned URLs are intended for the S3 API endpoint. Use the supported endpoint for signed operations and design custom-domain delivery separately.
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