How do you delete photos in Storyline 360?

Call Me crazy... (and a newbie)... but I cannot figure out how to delete photos in Storyline 360.  Does anyone know how to do this?  There is no menu option for delete. the trash cans are grayed out. I can't find anyway to get rid of an inserted photo except to hide it in the timeline, but that could lead to a lot of unwanted clutter in the timeline.  Thanks! 

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