To delete a file or a folder select it and press the Delete button or drag'n'drop it to the Recycle bin folder. All files will be moved to the Recycle bin folder. To delete all files from Recycle bin click on the Empty recycle bin context menu item of the Recycle bin. To restore files from the Recycle bin select the file(s) and call the Restore selected items context menu item. If you try to delete any file which is opened on other computer the warning message will appeared. When the database will be updated outside the database in your computer will updated automatically.