Thanks for the review. In SingleFile, tags are called "variables". They allow you to customize the name of the file with dynamic values (e.g. the save date, the title). You can customize the name via the setting "File name > template" in the options page. See the chapter "Template variables" in the help page (via the link at the bottom left in the options page) for more info about the list of variables you can use. Note that you can also save pages into sub folders of your download folder by using "/" in the template to define sub-folders.