Hi @OJOSHGAZMER,
As a Canvas admin at my institution, I would agree with the basic approach @dbrace laid out (you may not have an ombudsman, but possible a principal or other school leader you could bring this up to.
It's very hard to rule out technical glitches with absolute certainty, but at the same time I really haven't ever seen a case where the student side would show a successful submission but the teacher wouldn't see it. In my mind, the most likely scenario here, which I have seen a few times, is that you went through the process to select your google doc as part of the assignment, but then didn't hit the submit button after doing that (assuming your school uses assignment enhancements, which I think most do at this point).
Realistically, though people here in the community can offer all kinds of advice on this, the only people who will be able to actually change your grade would be at your school, which is why we're suggesting you go that route. You may not get immediate satisfaction, but if you're persistent and present the facts, you may be able to get a result in your favor (though we can't ever guarantee that).
Hope this helps a bit.
-Chris