Thanks for reaching out. Have you taken a look at our Help Center article which has more info on why custom thumbnail option is not enabled: https://goo.gl/bh88gZ . Hope this helps.
@TeamYouTube So I've just verified my account but i'm still not allowed to upload custom thumbnails. I don't understand?pic.twitter.com/N40T1nV23t
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I've just checked again and it seems to have sorted itself out. No issues anymore. Thanks for getting back to me!
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