I have a rather large video I need to embed on a page (7.2gb), I and able to embed it but the video doesn’t play only the audio. I’m assuming that the size is an issue, but perhaps there is another explanation, no?
I assume you try to embed a file directly and not embedding one from a video hoster?
Your video must stream must be in a format playable by webbrowsers. The file extension like .mp4 or .webm does NOT grantee the right encoded video stream is inside like x264 or VP9. You did not follow the instructions, did not provide a example … so I have do a guessing game. I am not aware of any size limitations. Try to open the file directly with the browser and see if it get played, if not then this is because of your wrong video stream.
How long is that video and what resolution does it have? 7.2gb sounds like it might be to big anyway and re-encoding it would also save you space.