Thanks Matt. I tried this on my wife’s phone which is Samsung S22+ using Chrome and it works!!
This beats the hell out of me☹️. I will compare her chrome settings to mine for starters. I will report back.
When I use https://tomswarbirds.com/Theater/Victory-at-Sea/Episode-01-Design-For-War/ (note the https://) to access your site, Google Chrome on my Mac will not play the video either!
So first, I would set the URL for your site to use https:// instead of http://. Second, enable auto-redirect to https. Both settings are done in backlight > admin > settings. Using a secure site (eg, https://), Google will rank your site higher and the browser will show the padlock icon.
This might fix your issue, or might not. But at least your site will be in a better state.