Why am I getting Error: Page Not Found message from imported course package pages?

I recently exported my Sandbox course content as a zip file (course package) and reset my course. Now that I am ready to import the course package back into my Sandbox, the HTML pages I created are not showing. I am getting an Error: Page Not Found message. The HTML pages were created using the Brightspace HTML templates found within the LMS.

Any idea on how to get my pages to work again?

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