From time to time we have to transfer pdf files to another company.
Before we used WinSCP version 4.? on Windows 7 SP1 x64.
After software update of our hardware firewall sometimes we got an error,
that the file could not be transfered.
Then we updated WinSCP to version 5.1.4 build 3020 and the problem went away.
Everytime the files can be transfered now but then we got another problem.
The other company either can not open the files or can not print because the files
somehow getting corrupt.
For transfer we use SFTP-3 and in WinSCP we use commander GUI.
For testing i used another SFTP software, for example Filezilla Client and with that we
got no problems.