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Can't reproduce anymore.
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Re: Can't store storing certificate

Please attach a full session log file showing the problem (using the latest version of WinSCP).

To generate the session log file, enable logging, log in to your server and do the operation and only the operation that causes the error. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

Can't store storing certificate

WinSCP version 5.19.4
Microsoft Windows Server 2019 Datacenter Version 10.0.17763.2237 on Amazon EC2
protocol S3
GUI Commander

I can connect to S3 and copy small files.
The issue starts when I copy a big file for more than an hour. I got a warning (attached) from WinSCP about the server's certificate is not known. I press "Yes" to continue connecting and store the certificate but the warning came again and again. As result, I cant copy big file overnight.