The answer
No. R2 presigned URLs are intended for the S3 API endpoint. Use the supported endpoint for signed operations and design custom-domain delivery separately.
What are presigned upload URLs?
Can a wedding gallery replace the R2 S3 hostname in a presigned URL with its custom domain?
More FAQs in What are presigned upload URLs?
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.
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.
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