Yes! our sFTP Client app has full support for connecting to local networks, as this is a native app and not a web-based app you can connect to any internal / external FTP / SFTP networks.
You need to enter the hostname (something like "home.example.com" or "ftp.example.net") of the server you want to transfer files from or to, and the username (something like "smith97" or "billsbakery") and password for your account on that server.
If this is an account you've purchased from an Internet service provider or hosting company, that provider should be able to tell you what to enter, depending on the package you've purchased from them and the level of support they provide.
Simple click on the red cross on the right hand side of the tab in which you're connected, this will cease activity within that connection.
Simply click on all files / folders in which you wish to change, right click (left click if you have your mouse setup to a left hand user) over any of the selected items, from the menu that appears you will see File Permissions, click on the relevant check boxes or change the numeric value to update the File / Folder permissions.