This feature has been asked for a few times in different contexts. We added a way to upload a file and serve it as
This can be useful to prove your ownership of your domain for some services (mobile notifications, etc.). You can also use this feature to generate your own sitemap.xml file. If you want to use this that way, you should uncheck the box that generates the sitemap automatically and upload an xml file.
You can upload the files in the Settings Tab, SEO & Metatags section. Note that this feature, as other SEO tools, is accessible on apps on a Personal plan and above.