1. If you no longer have the photos saved on the device you are loading photos to theRPF from, save your photos.
2. Edit your listing (not “manage your listing”) by deleting all of the photos here.
3. Save your listing.
4. Edit your listing again, but this time upload only the photo you wish to have as your cover photo.
5. Save your listing.
6. Edit your listing again and now upload your other photos and place them where you want them.
7. Save your listing.
This should take care of it. Always upload your desired cover photo first and by itself, then come back and add the others.