There is a workaround: there are two options for WLM's signature, one is to edit it directly, and the other is to import it as a file. File import supports two formats, one is txt, and the other is htm and html format, that is, web page format. Speaking of which, you may know. First, edit the signature with all available tools, and then save it in htm or html format. If you can't use other tools, you can also save WORD in web format. Save it and import it with WLM.