How do I add supports to a model?

Hello,
I am trying to print a student's model.
- When I slice the model, I can see the supports.
- But when I exit the slicer section of Grab CAD, the supports disappear, and then, more importantly, the model starts to print only the model with no supports.

How can I remedy this issue?
Any suggestions would be appreciated?
Thanks,
Chris

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