zhushen12580 as FreeFlarum is a free service that aims at providing forum owners a starting point for their communities, I do not plan to support the upload of custom files under forum's root anytime soon. This is something that can be done if you self-host your forum, which is usually recommended if you'd like to run an advanced/bigger community anyways. Also, IndexNow by Bing is one of the more... "advanced" features that would most likely require a custom extension to be developed - one that will ping Bing's API every time content on your forum is created, updated or removed. So, even if I did upload the file for you, a system that pings the API would still need to be implemented anyways.