Is it possible to use AWS STS (Security Token Service) credentials with FileZilla Pro to access an S3 bucket?
The IAM policy we have on one of the accounts enforces MFA usage, so the normal access key / secret key can only be used to generate a MFA-authenticated STS session, with a temporary access/secret key and token. When configuring FileZilla, I see a spot for the access/secret keys, but not the STS token value.
Starting with version 3.49.1 (July 15, 2020) FileZilla Pro supports STS provided credentials with or without MFA.
Here is an article from FileZilla's Knowledge Base that may help you with your question: