Customize send-http-url PUT filename

Is there a way to customize the filename that gets set on send-http-url?

I’m looking to save warning, error and critical logs in S3-compatible storage (MinIO).
I got it working to upload the file, but I can’t seem to actually save it with a timestamp or number in the name.

The content itself also appears to be URL encoded. Is there a way to just save this without it being URL encoded?