As far as I know,
FileServer should not modify any names which comes from client. So it seems that the "filepart" suffix was added by client.
Can you please send us communication log to firstname.lastname@example.org (or post it here). It can be created like this:
var server = new FileServer();
server.LogWriter = new Rebex.FileLogWriter("C:/server/log.txt", Rebex.LogLevel.Debug);
This is server log when I upload
185 MB file:
2017-09-06 18:45:10.649 DEBUG SftpModule(1) SFTP: Opening file '/OUT/Foto1.zip' (Create, Write): success.
2017-09-06 18:45:15.033 DEBUG SftpModule(1) SFTP: Closing file '/OUT/Foto1.zip': success.
My output from
File upload finished.
total bytes: 185523333
As you can see, there is no "filepart" suffix.