Nice thoughts but this: "Unfortunately as we know, this book is missing in both the Jewish and the Protestant Old Testaments. Jews, after Christianity was established, dropped this book because it was not originally written in Hebrew. And the Protestants dropped the same book saying, “Who better than the Jews know what belongs in the Old Testament.” It is however, one of the inspired writings of the Catholic Church."
isn't quite the case.
D. Purpose
To show that God is faithful to those that are faithful to Him is evidently the chief purpose of the book, Neubauer (op. cit., p. xvi) makes out the burial of the dead to be the chief lesson; but the lesson of almsgiving is more prominent. Ewald, "Gesch. des Volkes Israel", IV, 233, sets fidelity to the Mosaic code as the main drift of the author, who writes for Jews of the Dispersion; but the book is meant for all Jews, and clearly inculcates for them many secondary lessons and one that is fundamental to the rest -- God is true to those who are true to Him.
E. Canonicity
(1) In Judaism
The Book of Tobias is deuterocanonical, i.e. contained not in the Canon of Palestine but in that of Alexandria. That the Jews of the Dispersion accepted the book as canonical Scripture is clear from its place in the Septuagint. That the Palestinian Jews reverenced Tobias as a sacred book may be argued form the existence of the Aramaic translation used by St. Jerome and that published by Neubauer, as also from the four extant Hebrew translators. Then, most of these Semitic version were found as Midrashim, or hagganda, of the Pentateuch
Excerpt from New Advent
http://www.newadvent.org/cathen/14749c.htm