S3 POST Policy signature fields; send unchanged as form-data during direct upload
| Name | Type | Description | Notes |
|---|---|---|---|
| key | String | Plaintext temporary object path, identical to base64_decode(file_key) | |
| contentType | String | Must match the decoded content_type from the pre-upload request | |
| xAmzCredential | String | AWS temporary credential and scope; submit them unchanged during direct upload | |
| xAmzAlgorithm | String | AWS signing algorithm; submit it unchanged during direct upload | |
| xAmzDate | String | AWS signing timestamp; submit it unchanged during direct upload | |
| policy | String | Base64-encoded S3 POST Policy; submit it unchanged during direct upload | |
| xAmzSignature | String | S3 POST Policy signature; submit it unchanged during direct upload |