Is there a way to import images into CC3 and work over them?

[Rhotherian]

Okay, thanks.

I seem to be having trouble, though. After I drag the image onto the canvas, it dissapears. I've tried clicking, double-clicking, pressing enter and simply letting go of the mouse button after dragging. but the image vanishes each time. What am I doing wrong?


Edit: I think the above may be due to a glitch I'm also experiencing at other times in CC3. when I tried to make a map from scratch just now, I found that all layers (I think they're layers) don't always show. For instance, after drawing land onto my ocean contours, the act of zooming in or moving the canvas causes the land to vanish and only reappear if I move the canvas some more. The same happens to the ocean contour layers, symbols, text, buildings and pretty much everything else. In fact, I never seem to be able to get all the layers - that is, everything that I've added so far - to show. Now, the base fill doesn't even appear anymore - the canvas is completely blank. o_0