I read through the forums and it sounds like Emby should know how to rotate photos and show them in the correct orientation. I am still however finding many of my photos are showing with the wrong orientation. I checked the exif data for several of these photos and they all have correct exif: Orientation values. Not clear why Emby is not therefore rotating them into the correct orientation.
I am running 188.8.131.52 beta on CentOS Linux. I tested this in Chrome, Android, and on my iPad using the iOS app. All show the same behavior.
Attached is the image, the exif data showing the orientation is 6 (meaning image requires a 90 degree clockwise rotation), and a screen capture showing it displayed with the wrong orientation. Please let me know if you need anything else.