Glass, near perfect. Had not considered it for a build surface.
I have pulled out your images and rotated and reloaded them. Definitely your end......:lol:
Depends on which way up your phone/tablet is when using your camera. The website does not change anything except compress image and resize to web friendly proportions. Phones/Tablets mostly have auto rotate screens which can be annoying unless you know which way up the phone camera is normal. EG; My Galaxy needs to have the click button on the right or else. Samsung tablet the same. A pain for me as I am left handed. Nearly all the photos I post up are from my phone direct to google drive and then uploaded from there to the forum. I know not much about iPads and the ilk but check settings for auto rotate screen/camera