If you are not seeing your Ancestry trees in either of these three places:
Making a Project:
Adding a Page:
Searching under Ancestry Records:
If this is happening to you, you will need to log out of MyCanvas and log into your Ancestry.com account. From your Ancestry account you will go to Extras on the top black toolbar and then to Photobooks and Posters. From there it will redirect you to MyCanvas and then you should be able to see your Ancestry trees again.