I am having a similar issue. I took 28 pictures on a digital camera. I edited them in an external photo editor. The pictures were all saved. I then uploaded them into wordpress. They were oriented perfectly. I look at them on a laptop or desktop, they look fine. I then looked on my phone, they are sideways. They were not taken with an iPhone and not uploaded through iOs.
Does anyone have a fix to this problem. I really do not want to have to reload all of them AGAIN, and am not even sure what I can do differently so that I don’t have this problem again.
Thanks for any suggestions
