Cloudflare Apps work in Preview but not on Live

I’m trying to get Cloudflare’s “Add HTML” app to work on the domain https://www.testhq.com.

It works in the preview for the app, but it refuses to work on live. I’ve enabled “Always Online” and proxy on the domain, as per the docs.

I’ve filed a ticket for it as well (2617269) but I haven’t had any response for 7+ days.

How can I diagnose the issue?

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Same exact question with the same exact app.

Trying to add a small line of code through the Add HTML app, it shows correctly in the preview but not on the live site even after changes are saved & confirmed.

Cloudflare Apps is unfortunately pretty much unmaintained and broken in some parts as it stands today. It’s something Cloudflare introduced a very long time ago, but as you’ve found, many of the apps simply do not work today as they’re not something directly maintained by Cloudflare. I don’t believe it was ever officially deprecated, but you can pretty much treat it as such.

I can only recommend you look at alternative solutions unfortunately.

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This was my alternative to editing the HTML in the base site (an older, compiled .NET web app with no modifiable HTML assets).