I have redone this presentation and increased the embedded text font from 14 to 28 on the text descriptions overlaying the images. I had overlooked that many people use their cell phones to view the presentations, and while they looked ok on a PC monitor they were unreadable on a cell phone. If this is still to small please let me know. It is difficult to get all the text and have the image clear as well but there are some other methods I can try if this is still a problem.
What also works on my phone (Samsung Note 8), is to pause the video at the image you want to see, then expand the image using the standard gesture method… which is to use two fingers moving from closed to apart. The text is then easily readable.