You have a plugin installed that is preventing it from displaying. Mine was Pagebuilder, another user said it was Advanced Custom Fields.
You must have a plugin installed that adds a feature to the editor. Disable it, and Amazon will work.
Hopefully amazon releases a fix
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This reply was modified 8 years, 1 month ago by digiSal.
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This reply was modified 8 years, 1 month ago by digiSal.