From Wikipedia
The Book of Enoch (also 1 Enoch[1]) is a pseudepigraphic work ascribed to Enoch, the great-grandfather of Noah and son of Jared (
Genesis 5:18).
While this book today is non-canonical in most Christian Churches, it was explicitly quoted[2]:8 in the New Testament (Letter of
Jude 1:14-15) and by many of the early Church Fathers. The Ethiopian Orthodox Church to this day regards it to be canonical.
It is wholly extant only in the Ge'ez language, with Aramaic fragments from Qumran and a few Greek and Latin fragments. There is no consensus among Western scholars about the original language: some propose Aramaic, others Hebrew, while the probable thesis according to E. Isaac is that 1 Enoch, as Daniel, was composed partially in Aramaic and partially in Hebrew[2]:6 .
Ethiopian scholars hold that Ge'ez is the language of the original from which the Greek and Aramaic copies were made, pointing out that it is the only language in which the complete text has been found[3].
According to Western scholars its older sections (mainly in the Book of the Watchers) date from about 300 BC and the latest part (Book of Parables) probably was composed at the end of 1st century BC[4]; It is argued that all the writers of the New Testament were familiar with it and were influenced by it in thought and diction.
-----
My thoughts. Who authored the Book of Enoch? Enoch? If so was Enoch an Ethiopian?
That is the problem with the book. The date and author. If there was a book of Enoch, like other Torah books, it would be written in Hebrew/Aramaic. And all we have are fragments of Enoch.
So my thoughts are that the original did not survive history. That is one reason to not include any so called books of Enoch today, we just don't know that we have the original.