Hey @mateusz828! I have answered your question on the other thread, we can continue the chat here if you need to 
Here: Nested Collections do not work - even on a replicated site of a clonable - #4 by Support-Luis
Hey @mateusz828! I have answered your question on the other thread, we can continue the chat here if you need to
Here: Nested Collections do not work - even on a replicated site of a clonable - #4 by Support-Luis