We'd like to know more. What device is this happening on? Have you checked other devices to see if it's happening there too? Let us know so we can get started on some troubleshooting steps.
Hmm, what happens when you try changing the thumbnails? Are you seeing an error message? Also, make sure you are following the recommended guidelines for the image size & resolution for your custom thumbnail: https://goo.gl/T0AbeJ . Let us know.
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Thanks for the info. We've passed this along to our Creator Support team. Look out for an email update.
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