Thanks to you all. It looks as though the problem may be that I embedded full screen (600px*800px) images in their own div, but not in a separate file. The beta reader kindly revised the ePub and put the full screen images in their own file, and says that fixed the problem. I must remember that validation is necessary, but not sufficient.
And thanks for the information about Blue Stack; I'll see if I can get it on my computer and test it.
I really appreciate your interest and help to an android ignoramus.
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