I have a old Winbook
It will randomize, Cross fade effects.
Dig deep into the settings. The options are not always obvious
BTW when I say:
Rotate , I think of portrait/landscape
I think you want a 'Slideshow' either by sequence or random
Since most of my covers are portrait, I hope your frame scales to fit (I expect that your fram assumes landscape and has no provision to Rotate if the frame was mounted portrait