All folders send and receive… i mean ignore pattern is myfile on node A (not !), sorry. But i guess i have to install all devices on all nodes, so that they “see” each other (using introducer node A).
Those two statements contradict each other: First one says you are syncing between all devices, include B and C, the second one says you don’t. If B and C don’t know each other, they don’t sync to each other - regardless of ignore patterns.