The Jewish version is that the original Septuagint was the Five Books of Moses only, and none of it survived. The term was then borrowed by Christians to intentionally confuse the history and lend credibility to their revisionism.
And it is mere fantasy that the Council of Jamnia ‘fixed the canon’. There was discussion about what role Aramaic rather than Hebrew could be used and still be called inspired. The canon was fixed after the First Exile. And that’s skipping the major difference between the Jewish view that the Five Books of Moses are primary, with the Christian view that later revelation is primary.
Jews see a natural continuation between the Tanakh and the writings of religious Jews that followed (the Mishna and others), while Christians believed Greek became God’s language.
“The Jewish version is that the original Septuagint was the Five Books of Moses only, and none of it survived.”
That is a novel idea. Since when was the Septuagint a translation of only the first 5 books of Moses?
“And that’s skipping the major difference between the Jewish view that the Five Books of Moses are primary, with the Christian view that later revelation is primary.”
Another odd idea. What makes you think Christians give the first 5 books lower status than what follows?
“Christians believed Greek became God’s language.”
Really? Another odd idea. I’ve never encountered it, but I’ve only been a Christian for 40 years...