Can't transfer my Xbox 360 worlds to Xbox One (better together)

Hi There,

I just purchased the Minecraft (better together) version last Friday 24th November 2017 for my kids. I've been trying to transfer their Minecraft Xbox 360 worlds as per https://help.mojang.com/customer/en/portal/articles/1797629-transfer-from-xbox-360-to-xbox-one. I can upload to the cloud from Minecraft Xbox 360, but there is no option to download from cloud on Minecraft Xbox One (better together).

Please help.