That worked, even just from the iPhone. Edit>rotate>Done. Edit>rotate back to normal >Done. Fixed.This is not new to iOS 11. I had that happen before on iOS 10 something, just not appearing for some photos. I forget at the moment exactly what the files were (sorry) but something to do with the thumbnails database corruption Do a google search and you should find the solution. There are a few files that need deleting then the thumbnails will recreate.
Also may try this. https://support.apple.com/en-us/HT205069 Seems I tried editing as mentioned but ended up having to delete the database file(s).
Cheers!
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Be careful with the iCloud upload. Make sure they are in the cloud before you decide to restore or anything.Suddenly having major issues with Photos. It was working fine all week and today it just went berserk. I'll try to delete pics but they'll randomly reappear, I can't save edited videos or portrait mode pics, its taking forever to sync with iCloud...so many problems.
I had to wipe my phone last week because photos weren’t showing up, were flashing into place and disappearing again, showing as black boxes in the collections view etc. Anyway, I got frustrated and wiped my phone. But it hadn’t backed them up to iCloud for the 7 days prior to that, so I lost all my holiday photos!
The wipe did force it to act as normal again, however. Besides this weird bug with blank thumbnails.