How to change endnotes to page footnotes in an e-book?

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Good afternoon!
There is a book converted from EPUB to DOCX with endnotes. Footnotes WORKING (those switched by means of Ctrl). For most of those who read books with footnotes (and in monographs there are up to 20 of them per page), they know how insanely inconvenient footnotes are at the end of a book or chapter, every time you have to jump back and forth. Therefore, it is quite natural to want to see them (ie footnotes) on the page that you are currently reading. But enough humor, as the drama begins! All attempts to replace footnotes with page footnotes offered by the Office or on the Internet LEAD TO ANYTHING!
Good people, help correct the situation!
https://cloud.mail.ru/public/r8p6/6sAsm2rfn
ps I send one of the many books as an example