I planned to setup SFTP with the Wiki provided by Syno. http://forum.synology.com/wiki/index.php/How_to_setup_an_sftp-server metod 3 was used.
Everything was executed and running fine (I can logon to the SFTP). The strange thing is, that in some folders I do see files (*.MPG) where in the photo folder (*JPG) I do not see any files (I do see the folders!).
When I connect through FTP there is no issue and I can see all the files.
In the above example, I use both the same users.
Hopefully you can lead me to a clue what causes this.