Background photos disappeared from all interactive labeled graphics in Rise course

I lost the background photos of all interactive labeled graphics. Even when I insert a new labeled graphic, there's no photo (no hot air balloons). Instead, my markers are still there on a plain background bar that's maybe 1 inch tall. I checked another unit within the course I am working on and the same thing happened to that graphic. It's gone. How do I get my pictures back - they were from content library?

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