It seems there is an issue about displaying the EXIF orientation tag :
If I open a portrait photo (captured from a camera), the orientation tag displayed is the same as for a landscape photo : Top-Left (1)
I have checked with the EXIF Tool "exiftool.exe" that display well a 90° CW rotation.
XnView v2.51.7 (2024-08-26)
- Open a portrait photo captured from a camera
- Edit -> Properties -> EXIF
- Edit -> MetaData -> Export EXIF Data
comment : the attached sample photo file is smaller than the original (the original is to big to be attached)