2nd aggregate storaga won't transfer to 3rd aggregate storage

[Bartholome Mitre]

This is a set up that I use regularly and never ran into problems before. However this time I have trouble with one of the storages.

I usually build chains of storages as you can see in the screenshots. They fill up each other and at the end of the chain is the factory.

The target is the steel mill and I have the same set up for coal running just fine on the other side. For some reason I can't figure out storage B won't transfer iron to C.

I ruled out power issues. The other weird thing is, if I jump C and just conect B to the steel mill, B will transfer the iron into the steel mill... so... what the heck is going on comrades? What am I missing here?

Thanks as always for your help.

https://imgur.com/a/cBI7a09

[Mr.Predator]

You need to build another conveyor engine between B and C, because storage buildings are passive and they don't transfer anything between them unless you connect to an engine or a factory.

[Sepis]

Put conveyor engine between C and B. Conveyor engine allways gets priority and it transfers stuff faster

[Bartholome Mitre]

Oh man! You are right! Thanks!