Can I Use Hot Spots on a Picture to Create a Pick Many Graded Question?

I have a picture that I would like to use to have the learners pick items on a workstation that don't belong, so I used hot spots to cover the items in the picture.  Then, I converted the slide to a freeform pick many interaction, but it doesn't work?  Any suggestions?  I've attached the SL360 file.

Thank you.

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