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If you are unable to select your .docx file in Kindle Create because it is ghosted, there may be a few reasons for this issue:
If none of these solutions work, consider reinstalling Kindle Create or seeking assistance from Kindle support.
This message appears because the security settings on your computer prevent the installation of software that has not been digitally signed by a verified source. You can make an exception for Kindle Create by adjusting your computer settings or contacting your IT administrator for assistance in doing so.