The related activity shows and works fine in Preview mode in Hype, but when I export and then run the page in a browser, the embed does not appear. Is there something I need to add to the embed code to make it work?
When pasting embed codes into your posts, ensure they are placed within a code block. I have edited your post to make the embed code visible.
Here's my feedback: Previewing in Hype opens a local web server, indicated by the URL 127.0.0.1, confirming the server is running from a local IP address. When you export a file, it is saved to the file system. Opening the file by double-clicking it operates in a different security context, limiting browser privileges to call resources due to security risks and sandboxing. To display the form, upload the exported file to your web server or run a local web server for testing. As mentioned, Tumult Hype runs a local server for previewing, thats why it worked in that context.