Kindle previewer won't accept my writing

I export my writing to my windows desk top but kdp previewer won’t accept it.

What do you mean you export it? Are you exporting or compiling?

You should compile to .epub or .docx. While Previewer will open .mobi that format has been deprecated by Amazon for submitting books.

Kindle Previewer 3 should have no issue opening the file you have compiled.

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Also, make sure you have an ePub that validates, or Kindle preview will choke on it…

Install a program that can validate ePub files or add a validator plug-in to the Sigil eBook Editor.

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