There is an html embed feature that may allow you to do what you want. However, I don't believe there's a way to do this by accessing the server. You can't upload files like that to the server on a GoCentral site because you don't have access to the backend.
GoCentral is meant to be a website with training wheels, for the most part. If you're looking for more advanced features you should consider something like a WordPress site.
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