What version of InDesign are you using? Did you choose any options on the Media panel for the MP4s?
Hi Steve. Thank you for the reply.
I am running Creative Cloud, so everything should be up to the latest version. In the media panel I selected play on page load and set the videos to loop.
I don't think Play on Page Load will work in an EPUB file.
Choose a Controller from the popup list. Choose Show Controller on Rollover. You'll have to click to play the video but you should see the controller when you move over the video.
I don't have time to do a quick test because I'm leaving on an errand. I'll try a test on my return.
I just did a test, placing an MP4 with the settings I described and exported as EPUB, then transferred to view on an iPad. It worked fine. It does need the controller.