I'm using a Debian Server and installed OnPrem 3.1 on it. Everything is fine but if i upload files or fotos with a german umlaut in it, the system outputs an error that it can't find the file. As i look in the kablink folders there are these files but with a wrong name for example: i upload "übersicht.jpg" and the file is naming "u?bersicht_....jpg"

Is there a way to fix this or is this a bug in OnPrem?