Is it possible to put adsense ads on an app on app platform in digital ocean?

I asked the question and now I am supplying the answer (my answer). Yes you can add adsense to a digital ocean app platform app site. The solution to my problems was to add the ads.txt file and not try to use the other 2 methods (1)adding meta tag or 2)adding <script>adsense stuff</script>). In my case, I was transferring a godaddy site to digital ocean app platform. Putting in the <meta> tag and/or the new <script> simply didn’t show up in the html. You see a mysterious https appear(I haven’t paid for it as far as I know) but that wasn’t why adsense couldn’t find my website (i don’t know exactly why the previous 2 methods were failing). But adding ads.txt is what worked.