[SOLVED] Can't add images to project

I’m following the first tutorial and am at the easy stage of importing images. I’ve downloaded the assets but whenever I try to drag them into the project the cursor becomes a circle with a line through it and doesn’t let me import the files.

EDIT: The issue was caused by the Defold program and folders being placed in the Program Files folder of my PC. Even though Defold was running as admin I was unable to import stuff - perhaps running explorer as admin would have fixed this too. My solution was simply to move the Defold program folder to My Documents instead.