So, let me guess at your situation. You can correct me where I am wrong.
Your school has been using Moodle. All of a sudden, your administration came along and said "We are switching to Canvas." You say, but what about all those questions that instructors have in Moodle? Your administration says "Don't worry, Canvas said you simply import them."
Now, your administration gave you the challenge to "simply import Moodle questions into Canvas." This is now what you seek to do. But you don't know much about either Moodle or Canvas. You make a post for help in Canvas Community, and a post on Moodle.org.
You discover that neither Instructure or the Canvas community can help. It appears that Instructure might have "deceived" you, and the Canvas Community is of no use. You are hoping that someone in Moodle.org can help. You have come to the right place, but this doesn't mean that Moodle users can solve all problems.
So far, all you have is this guy Rick who says "contact your LMS company." And, Rick can only say "Good luck." Now, I am not trying to be discouraging, I am just saying that it might be a little difficult. If Canvas told you they can do this, tell them "show me, or else I cancel our order."
But I will stay positive. Perhaps you will find someone who has had success, so don't give up.
Also realize that Moodle has a different set of question types than your LMS, so you might only have luck with T/F, MC, and Short Answer. And you might lose something in the translation.
If you have questions in their original delivery format, like "Blackboard", you might have better success. Also, some textbook authors now supply their question banks in multi-LMS formats, including Canvas.
I will watch this discussion to see what I can learn from you and others.
(Incidentally, my school switched to Canvas about five years ago, and I still use Moodle. Moodle's question bank and quiz engine is far superior to the other LMSs. But I do understand that if your school switched, you are stuck with whatever your school purchased.)
Here is an interesting video that I came across a while ago that might help.
