We'd like to help. Are you getting any error message while uploading thumbnails? Does this happen across devices? Also, any screenshots would be appreciated. Keep us posted.
Thanks for the screenshot. Try using a different device to upload thumbnails and see if it makes a difference? Let us know if this works.
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Tried it with my phone, and a different browser..... same results
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Our Creator Support team can look into specifics and help you with more info. Get in touch here: https://goo.gl/BxLi8H . Hope this gets resolved.
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