Uploading the .txt file is easy, but you’ll also need to come up with a way to push/submit new topics to the indexnow api in step 3: How to add IndexNow to your website | Bing Webmaster Tools
Uploading the .txt file is easy, but you’ll also need to come up with a way to push/submit new topics to the indexnow api in step 3: How to add IndexNow to your website | Bing Webmaster Tools