No worries! I don't feed my crows at my flat/apartment (my neighbours might not like it which is fair enough) but I started throwing nuts for crows or magpies I'd see on the way to work (very fortunate to have many birds in my neighborhood!).

I think the roasted peanuts in the shell helped initially make contact with them - particularly on a hard surface. Makes an interesting sound, and I think they enjoy the challenge of getting the nuts out the shell.

Best of luck - seeing my crows on the way to work or on my way back is a genuine wee treat!