Just saw this reply, thank-you haven’t tried those things, as I just now figured out that I need a postBuild file and I can put stuff there like enabling extensions, so I added jupyter trust … and it worked!!
I noticed that the metadata for the cell said ‘trusted: false’ in the Binder rendered notebook, but it was trusted in my local version.
I don’t understand how this works, and why 2*3 is run without trust but displaying a video is not, but happy I found a cleaner solution than my previous horrible markdown hack.
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