Maybe I missed the point somehow, but it seems to work without electricity (screenshot: https://prnt.sc/AaNWT_797rHw )
Inserters can grab from storage and put inside the storage without any issue. Did I misunderstand something?
It seems that this is related to hidden storage, why is it so high? I though I could save UPS replacing my warehouses with memory storage units, but considering, there is 300 hidden slots, that will not solve my issue, correct?
Edit: Yeah, it stopped inserting when it reached 300 slots. Can we maybe get mod setting to adjust numbers of hidden slots?