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Alright, checked the website & couldn't find anything that I can detect on why the difference; had thought it was the number of pixels as in 600x600 vs 300x300; was shot down when looking at another volume that worked at the 300x300 & the images I checked were all jpeg.
However, found that the zoom feature can be activated in the "basic" zoom mode(??). On the long press, the image remained the same size with a black background (in my case like "night" reading) BUT I can then zoom by just using "multiple" touch like enlarging text! I just used 2 fingers or thumb & 1 finger to make the image larger; to get back to "text mode" I would have to do the "goback" key. Oh this worked on the volume that didn't do the long press zoom but after I did the 2 finger zoom, 1 image did do the long press zoom!(??!!); wouldn't know if this affected the rest of the reading as this was just a check & the long press zoom was a surprise.
Still doesn't say why the long press zoom worked on some images & not on others......
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