how do you add cloud to multiple granary camera feeders?

So I have 4 granary camera feeders (2 are backup in case the other 2 fail while i'm away). Is there a way to get cloud subscription on 2 out of the 4 feeders?

I have a subscription for one already but when go to one of the devices without cloud and go through video history > try cloud, it overwrites the existing one rather than add.