I have an external iFrame on GitHub that I want to embed, but it appears to be blocked.
Any ideas how I can do this or an alternative place to store my external HTML code to embed?
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Not sure if this helps, but I have done similar before in product pages. I edited the description HTML then added the following (in my case adding a video from YouTube):
<iframe src="https://someurl" allowfullscreen="" width="560" height="315" frameborder="0"></iframe>
I suspect a tweak of something like the above would work for you. You could probably add something similar to a liquid file too.
It possibly depends exactly what the content is and where it comes from with regard to it being blocked. More information would be useful to get a more accurate answer.