Sorry, there's no attachment.

Can you attach a complete log file both from 5.7.3 and the previous working version?

ÍTo generate 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.

The current version of WinSCP does not find all files in the folder on the remote sftp server.

Please see attachment.

I have had to downgrade to a prior version to successfully get all files.