iSpring HTML link code fails in HTML block

I am using iSpring Cloud to store powerpoint files I use for online courses.

iSpring provides a link script (or iframe) for a file, which I load into an HTML block.

The script works fine in Elementor, but I cannot get either the script or iframe to work on a Gutenberg block (either on a new page, or a lesson or topic page in LearnDash). When copied into a block, I get a black screen and a spinning circle that never resolves.

Has anyone had this experience, and was there a resolution that worked?

All help appreciated.

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