I have diabetes, which affects my eyesight, so I have a real problem with the default smaller smaller fonts most use here, so I apologize, but really struggle with reading the smaller default font.
Actually the Septuagint is a Misnomer, and never really existed. The truth is, in spite of it's wild Jewish legend, was that the Jews were tasked with writing their law into Greek, and only did so with the five books of the Torah. And the Jews also highly revered the Scroll so badly, that their scriptures could only be found in scroll form. The Jews had the Codex, or what we know as book, but used it only for secular tasks.
But after the Torah was indeed translated into Greek, many individuals over time likewise wrote other OT scrolls ( individual books in their scroll form, ) until eventually all of the OT books, in scroll form were translated into Greek.
And these versions using Midrash, or reinterpreting texts, did so in a highly Messianic sense / expectation, etc.., And thus all such scroll books, translated by many, who no one knows who they were, were all over the place in quality. And multiple versions of some OT books were translated, so for example short and long versions of Daniel were even translated, with the longer version with new material, such as Bell and the Dragon, were added, but were never in the original.
But eventually Origen came along, and wanted to codify the Septuagint, taking what he thought were the best version of the OT scrolls, and he created the Septuagint as all found together in one book.
But his version of the Septuagint was really the creation of his Hexapla, which was really a six parallel columns of the OT, two of them in Hebrew, and four in Greek to compare them side by side. He thus collected the Septuagint Scrolls he prefered in his Book, with an Old Greek parallel version, which was written by Jews to clean up the sloppy translations of much of the Septuagint versions, and to remove some of the Messianic Midrash, etc..,
And eventually ver time, some scribes cleaned up some of the column differences, so the original Origen compiled was tampered with.
You need to buy a new Interlinear Greek English Septuagint, to be able to read a lot of this, together in one place. I have such a modern Interlinear Septuagint by a Christian publisher, as well as other Christian books on the Septuagint, to read all of thisd.
On the other hand I have also bought more than a few much more recent Monograph series of books, usually published by various Christian University Authors, on their own University Press, which vary in price from low, to very expensive - But have bought several of these Monographs on the Gospels.
And they go into a lot of study, including heavily on statistics, etc.., and on Matthew, etc.., their studies show in the gospels, that about 60% of the OT quotes come from the Septuagint, and about 40% of the OT quotes come from the common MT version of the Hebrew OT, with a rare quote here or there, from a different Hebrew OT, and even an instant of a new quote version of the OT hebrew, from the gospel author himself.
And you are correct, I personally believe the Apocrypha to be evil, which always contradict the actual bible in many instances and places. The Apocrypha is extremely evil, though loved by some scholars, for research purposes, for a historic aside / investigation, etc..,