Upload the zip file in Server Settings > Plugins page.
After uploading, you will see the I18N error as following. But don't worry. This error means "you need to restart TeamPage server to load the I18N resources (language files)."
Click [Restart TeamPage] in Server Settings > General > Manage Server page. If your TeamPage server is hosted in Traction's cloud environment, you will need to restart your server twice to load the I18N resources correctly.
After restarting, you will see that the plugin's name show up correctly.
Basic How-to
Click [Insert/Edit Widget] button in the tool bar and select [Share Folder Tree View] link in the dialog.
Specify the target path, the target space name (not space's display name), or the target entry's ID.
You can specify a share folder in a project or a milestone by entering its entry ID.
You can select the icons for All Spaces and each space's root folders.
You can select the order of the files and folders.
Confirm that the widget is inserted in the richtext editor. Submit (save) the entry.
The widget shows the specified folder.
If you set the tree to start drawing from All Spaces' root folder, select the home icon for All Spaces' root folder and the cabinet icon for each space's root folder, the tree will be like this.