I noticed this happens when you flip the camera horizontally, with the volume buttons on top. Since the volume button doubles as the shutter button this is probably what most of us do, not sure what they were thinking with that.
Same Problem. Sometimes when I take a picture right-side up, it will save it upside-down. I'm curious what causes this and then why I also can't find the rotation ability while trying to edit it to fix it.
Weird, I just tested on a Galaxy S8+ on Android 8.0 and got the same result.
It seems it reverses the sensors in the camera, because if it is upside down, and you rotate the phone so the volume buttons are on the upper side (Landscape photo) it flips to up = up, and keep flipping so the volume buttons are at the lower right side, it stays correct, but the camera button,cancel and save don't reorientate with it.
But if you hold the phone right it is indeed upside down.
This is just me confirming the issue though, I can't fix it, and don't work with the app in question. But it isn't a you problem, the app does it wrong (At least in regard of the Samsung S8 family).
When I use the camera to capture something in this app, it displays the image upside down while trying to capture. The captured image shows the correct way up, but it's hard to focus correctly on the item when trying to capture and it's shown upside down.
Have you seen this issue before?
My phone is a Samsung Galaxy S8.