Okay... I must google what is a trace file and found this https://winscp.net/eng/docs/debugging
I use winscp 5.14.2 (Dev Build 8964 2018-11-20)
No. In September and November, on four different occasions, I've sent you a debug version of WinSCP to your email address. I need you to use that one. I'm sending you one more copy now.