I had the same problem at the beginning.
I'm no longer 100% sure, but either a reboot or a factory reset helped me.
Factory reset works without losing your maps: https://homesupport.irobot.com/s...

I didn't have to make any additional settings for this. However, Roomba only takes photos and reports them (in the cleaning report at the end of each cleaning round) when it has recognised new obstacles. The best thing to do is to place a shoe lace or something similar in the centre of the room. Roomba should recognise it, avoid it and provide you with a photo in the cleaning report at the end.