Same problem here 
Version 68.0.3618.31.
Solution for now: installed User-Agent Switcher and changed to Android:
Additional advantage with this addon – You can post images to Instagram 
Posts made by mw51
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Opera for computersRE: [Solved]No Thumbnails on Google Photos
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Opera add-onsRE: Install Chrome Extensions
Doesn't work anymore in Opera Beta... Please fix it
Edit > After reinstalling it works again
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Confirm close on exit +1
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