http://rotatemailer.com/
Or...
http://www.makeuseof.com/tag/rotate-video-files-mac-pc/
https://9to5mac.com/2016/10/13/googl...p-ai-features/
Do you take the photo's in landscape mode? The orientation of the way the photo is taken could be the reason the photo's look normal but display it the way the picture was taken. So if you take a picture sideways, it will show normal but as soon as you send or post it, it will display it as it was taken.
Don't know if an APP will help but a start as it may fix your problem??
Dave
67 Nova Boy