The only Blackboard content that was migrated to Canvas was Fall 2018 and Spring 2019 courses that you were listed as an instructor. There are shells for Spring 2020, Summer 2020 and Fall 2020 in which you can import content (just as in BB you had to copy content from one semester to the next). Additionally if you taught a course and do not have a Canvas shell you will need to export/archive it’s content. There are sandbox courses on everyone’s Canvas site, you can import the content into one of these courses.
Instructions for importing/archiving your Blackboard Course can be found here
Migrating-Bb-Content-to-Canvas
Need assistance contact OET, have questions join OET for WebEx today, 4/29, https://ecu.webex.com/ecu/j.php?MTID=m800ad012cfc7946a9e4590274e61abaa