Connect to S3 using Temporary Security Credentials

Hi,
Trying to use the Amazon S3 protocol to connect to a S3 Bucket.
Using a AWS user this works correctly, however we need to use temporary credentials to connect to AWS rather than the named user. As per my understanding the session token needs to be provided as a header as well as the access key id and secret access key https://docs.aws.amazon.com/AmazonS3/latest/API/RESTAuthentication.html#UsingTemporarySecurityCredentials

Is there a way to provide this header within WinSCP?

No, WinSCP does not support this.

This request has been added to the tracker:
Issue 1839 – Authentication using temporary credentials from AWS Security Token Service (STS)
You can vote for it there.