mp4 video refuses to start playing without mouse click

I'm updating an old course that had a SWF animation. I converted it to mp4 video, no problem.

I insert it into my course (insert undefined from file), no problem.

I go to Properties and choose Autostart. It does not start unless clicked on. Problem.

I add an OnShow action to play it. This does nothing. Problem.

I add an action at the page level to play it on show. This also does nothing. Problem.

As a test, I create a button with an OnMouseClick action to play the video. This works. However, if I change the trigger of this same action to OnShow, nothing. Problem. On the other hand, if I leave the OnShow trigger but have the action display a message, that works, so I know the OnShow is triggering.

I wondered about some sort of codec issue, so I converted the video to uncompressed AVI and let Lectora convert it back to mp4. Same behavior.

I created a brand-new Lectora file containing only one page with the video on it. Same behavior, so it isn't a corruption of the original AWT file.

Darrel Somoza very kindly customized a mediaJS player for me, which I'd love to use, but it doesn't autoplay. Maybe I'll try to customize it further to do that. It still would not give the "OnDonePlaying" Lectora event, though.

Lectora 17.0.6.

Thoughts?

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