UploadPresignData

{
    "method": "PUT",
    "upload_url": "https://example.com/uploads/user/12/20260519-abcdef.png?signature=example",
    "object_key": "uploads/user/12/20260519-abcdef.png",
    "public_url": "https://example.com/uploads/user/12/20260519-abcdef.png",
    "expires_in": 900,
    "content_type": "image/png"
}