The answer
The object could be replaced after validation while upload permission remains valid. Design finalization so the accepted photo cannot silently change to unvalidated content.
How should the backend verify that a file was uploaded successfully?
Why must upload finalization account for a presigned URL that is still valid?
More FAQs in How should the backend verify that a file was uploaded successfully?
No. The backend must verify the server-recorded object and its requirements. Client claims cannot establish storage ownership, actual size, or the validity of image content.
No. It retrieves metadata and can confirm object existence and size. Validating image content requires additional trusted checks against the actual bytes and processing limits.
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