We use the add_Folder api call. With bittorrent Version 1.3.109 I can add a Folder with existing files for sync with bittorrent. With Version 1.4.75 I got the Response: http://api: ... /api?method=add_Folder&dir=c:\start { "error": 105, "message": "Zielordner ist nicht leer. Trotzdem hinzufügen?" } Can anyone give me a tip? I want to sync I Folder with existing files. With the Desktop Client, there ist no Problem. Thanks