Hello Horokey,
I attempted to provide suggested workarounds to this thread. After submission it appears that my comment along with yours has been removed through an error on the AnswerHub. I have rewritten the my comment below.
Comment:
The Answer provided above was to inform you that this issue is a know issue. The link provided was to allow you access to the thread that will be updated when the status of this issue changes. The link was also provided so as to put you in touch with others who are experiencing this issue. I hope this information helps.
Suggested workarounds for this issue in particular:
- Rotate the image within a material
- Rotate the image outside of the engine and then import the new image(s)
- Rotate the image using a flip book texture (that will need to be created outside the engine)