Your sandbox courses are handy spaces to import your content from Blackboard and give you an idea how the course looks in Canvas.
If you were a many folder course creator the transfer to Canvas may look a bit messy and take a lot of reorganization but no worries you can easily “Copy” specific content from your Sandbox to your actual course. Go to Settings, Import Content, Select Copy a Canvas Course, enter the Course you want to copy from and then select the Radio Button for Select specific content.
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