Generate an S3 presigned URL for uploads

Hello,

How can I generate a presigned URL to upload files to S3 ?. When I generate a presigned URL using the Delphi_DLL I can use a GET http request to retrieve the file, but I can't use it with a PUT request to upload a new one.

It returns this error : "The request signature we calculated does not match the signature you provided. Check your key and signing method."

Thank you.