How come Photomath is not recognizing problems from my textbook?

One day we hope to explain every type of problem that exists in the world, but today Photomath Plus is limited to problems in supported textbooks.
Our math experts are working hard to write helpful answers to problems for the most commonly used textbooks, but there are still a whole lot of textbooks out there to cover.
[To ensure that we have explanations for all problems in your textbook, you can send feedback to us requesting your book.]